My custom exhaust

[Tonavi]

I had a custom exhaust built last Friday, with dual tips in the center. It was built from the axle back. (pictures are coming as soon as I can get a camera) I drove around and the car sounds GREAT on the outside, not too loud, raspy, etc, but on the inside of the car, there is an agonizing drone at all speeds. I went back to the shop and they said putting in a glass pack in the midpipe would solve the problem, but I was skeptical. An 18 inch one did nothing. Then we tried a 24 inch one. The vibrations are gone but the car is still so F&*@ing inside I can't stand it. Is there anything I can do to quiet it down, without investing too much more money? I'm in almost $500 and wished I never touched it to begin with. It almost makes me want a different car. :cry:

I thought of sound insulation, but would probably need so much of it I'd be better off buying the OE setup.

Any help would be appreciated.

[Tonavi]

I also bought new tires, going from 185/60/15 to 205/55/15 expecting a small drop in economy for a huge gain in traction, but I seem to be getting 10-15 MPG LESS than before, on the same aftermarket rims. I have them aired high, 42 psi, and still no improvement. Could this be attributed to winter and should I wait to see if the tires really have a bad effect? In winter, I generally got 10 MPG less anyways even on the OE Potenzas. The car looks great, but this combined with the exhaust issue is so depressing...

[cali yaris]

I seem to be getting 10-15 MPG LESS than before, on the same aftermarket rims. I have them aired high, 42 psi, and still no improvement. Could this be attributed to winter

In winter, I generally got 10 MPG less anyways even on the OE Potenzas.

um, didn't you answer your own question?

[cali yaris]

as for the exhaust, some pics would be great. And here are some questions for you.

Did anyone from the shop say "this might be louder" before the work was done?
Did you talk about what you wanted in terms of volume and tone, or just the design of the exhaust?

1. What is the piping diameter of the parts you had changed? (resonator/piping/muffler)
2. What muffler did they install?
3. What resonator did they install?

[Tonavi]

um, didn't you answer your own question?

I wasn't expecting the overnight drop like that though. And since I got a Scangauge, the numbers look even worse. I used to have no trouble topping 45-46, now I'm lucky to even see 30-32.

For the exhaust, I knew it would be somewhat louder and deeper. Even the shop owner, who did the work, wasn't expecting the car to be as quiet as it was on the outside. I had someone drive it and I followed them. Sure enough, can't hear anything. Get into the car and start driving and it's like there is a rocket behind you all the time. I told them I wanted something that's a little louder than stock, something without being "ricey" and raspy like a can. They said this setup would have a different effect: it'd be a bit louder, but not unbearable at all from the inside. What we started off doing was unhooking the stock muffler and starting it up. Without anything on, it sounded quite nice! Not even loud. Even from inside the car, it was relatively quiet. I was expecting the piping to calm things down the rest. He then made a replacement from the axle back and split it into a dual tip setup. Looked and sounded wonderful in the garage. I drove around with everything else (resonator, cats, 2 inch piping, etc) stock without a muffler and by the time I got home, I thought I had a hearing problem. I went back and he tried the smaller glass pack. I didn't think there would be a difference, and there wasn't. He said a 24 inch one would do better, if add some restriction. He showed me the big one next to the small one and I tried it. Cost me another $107. Drove around the shop, and some of the vibrations were taken care of, but that droning remained. He said without redesigning the system, this was the best it would get. I left and got on the highway to come home and felt as if I'd flushed down another $107. It didn't even help at high speeds.

[cali yaris]

thanks for the answers.

I'm still looking for this: which resonator and muffler were installed and the size of the piping.

I've done what you've done three times over, so I might (or might not) have some guidance in terms of products for you.

[Tonavi]

The stock resonator was ditched to fit the glass pack the second time around. There is no muffler, and the piping is bent in such a way that you couldn't add one. All of this was done with 2 inch pipe to keep everything the same as stock so it wouldn't get too loud.

[redglare45]

I think if you add muffler, it should quiet it down a little more. I have a glasspack like you, in place of the stock resonator. Here's my setup: AFE Intake, Megan Header, 28 Thrush Glasspack http://www.summitracing.com/parts/WLK-24214/ and a Dynomax Muffler http://www.summitracing.com/parts/WLK-24215/ .The piping size used was 2.25

[Tonavi]

So you think if I add a muffler like that Dynomax it will take care of it?

I would have to redesign and rebuild that exhaust so extensively that I'm afraid I'll be better off going back to stock, which I don't want to do because I actually do love the sound. I just want to control it more.

[cali yaris]

That will help a lot. I did a center exit, twin-tip exhaust and fit in a Magnaflow muffler just fine.

[cali yaris]

stock is less than 2", just to be clear.

[AzNguy]

If you want a quiet muffler at startup but really loud when you rev, then the Dynomax Super Turbo muffler is perfect for you. Here's my video...http://www.youtube.com/watch?v=R0DuRoqPSHE

And sorry for the end :)

[Tonavi]

I'll have to post a couple pictures when I get access to a camera for you to see. Is it possible to put a muffler before the axle-back assembly to avoid cutting that up? I ask because I spent over $400 on having that made by now.

[cali yaris]

I really don't know where you'd put it. It's kind of meant to go after the axle, but maybe someone else will have a creative idea for you.

[Tonavi]

I've been driving around a lot lately and think I can get used to it. This is my first car, therefore my first exhaust, and so maybe I'm not used to the difference. The car sounds great at full whack though.

A video of it is coming soon.

[Parmas]

I felt about the same when I reinforced the rear mounting. When engine revs down from 5K it vibrates + constant engine loud noise all inside down till 3.5K rpm

[Tonavi]

All of the noise in my case is from 1500-3000 rpm, right where I do all my driving.

[jekqmb]

Well there is your problem...You have a straight pipe in an N/A car, ummm duh its going to be loud. haha

[ozmdd]

One thought would be to do some generic dynomat along the center tunnel and especially in the spare tire well, which is totally uninsulated. Might cut that drone down significantly. Also, much cheaper than exhaust work.

[Tonavi]

As I'm unfamiliar with dynamat, how much would that cost? Should I pull the seats and carpet, then insulate the whole thing? Or just the back end, since that's where the noise is coming from?

[cali yaris]

do the rear first, it will make a difference. And there are other products out there that are less expensive than Dynamat and seem to work about as well. Check the Audio section on here for those threads.

[Tonavi]

Just for fun, before school this morning, I stuffed a pillow and some blankets in the tire well and things calmed down significantly.

[cali yaris]

there ya go

[xbalance]

I plan to install a custom make header for my yaris but still not sure few item.
what is the most ideal size for 4-2-1 header setup?

Example size for 4-2 & 2-1 tube size and best length to built?

for the 4-2-1 final 1 out if use 2" tube will it be too big for our little 1nz-fe to push?

[Tonavi]

I plan to install a custom make header for my yaris but still not sure few item.
what is the most ideal size for 4-2-1 header setup?

Example size for 4-2 & 2-1 tube size and best length to built?

for the 4-2-1 final 1 out if use 2" tube will it be too big for our little 1nz-fe to push?

I wouldn't know, but I've heard that there's no point to going more than 2.5 inches on this motor unless you have forced induction.

[xbalance]

Noted, will use 2" tube. what about the tube size from 4-2 should be and the length needed?

[Tonavi]

Noted, will use 2" tube. what about the tube size from 4-2 should be and the length needed?

Again, I wouldn't know as I never built a header. I'd take a look at an aftermarket one like the DC Sports header and maybe model yours after that one. There isn't a whole lot of room because the exhaust is on the backside of the motor and is very short.

[shinlee]

When I had my custom exhaust done for myself, the guy at the shop decided that since I said I wanted a more performance oriented exhaust he'd just slap on a straight 2'' pipe and run it out the end, sounded fine on the outside, but I got inside and drove it for 10 mins and it killed me. Fortunatley, that was just him testing the waters for me, since a straight pipe is the most performance minded, and I went ahead and had him install my flowmaster 60 series in, and then it was like heaven. It roared at WOT, but you couldn't even tell I altered it at cruising rpms.

Without a muffler, it's going to kill you, and without a resonater, it's going to sound raspy... My exhaust was done resonater back, so as to avoid the raspyness. Good luck with noise though

[Herbicidal]

I had a custom exhaust done about a month ago now. Replaced the stock muffler with an Imco model. It went in the place of the original resonator (almost exactly the same size and shape so it fit very well), then a new Imco resonator went between the rear axle and the dual, rectangular tips (center exit). So essentially the muffler and resonator swapped locations. I ran it like this for two weeks and decided it was too loud, especially inside. I also debated about doing some sound deadening material in the trunk, but decided to take it back and add in a second Imco resonator. The shop was able to put it right after the muffler and it is also a straight through design, just like the first one. This reduced the sound again by about 1/2. Just perfect for me! I may still do some sound deadening in the trunk, but no longer because of the exhaust, more from how there is no insulation back there at all! Hopefully for you the sound deadening will make it sound just right. :thumbsup:

[psykobowler]

I had a custom exhaust done about a month ago now. Replaced the stock muffler with an Imco model. It went in the place of the original resonator (almost exactly the same size and shape so it fit very well), then a new Imco resonator went between the rear axle and the dual, rectangular tips (center exit). So essentially the muffler and resonator swapped locations. I ran it like this for two weeks and decided it was too loud, especially inside. I also debated about doing some sound deadening material in the trunk, but decided to take it back and add in a second Imco resonator. The shop was able to put it right after the muffler and it is also a straight through design, just like the first one. This reduced the sound again by about 1/2. Just perfect for me! I may still do some sound deadening in the trunk, but no longer because of the exhaust, more from how there is no insulation back there at all! Hopefully for you the sound deadening will make it sound just right. :thumbsup:

I just brought my car in at All Muffler today. They quoted me around $474 for the longer imco muffler, dual exit 4 tips in the back. I am planning on getting it done in 3 weeks. I did not ask for a resonator after the muffler. They said since I will have a dual exit it will significantly quiet the sound.

[Herbicidal]

I just brought my car in at All Muffler today. They quoted me around $474 for the longer imco muffler, dual exit 4 tips in the back. I am planning on getting it done in 3 weeks. I did not ask for a resonator after the muffler. They said since I will have a dual exit it will significantly quiet the sound.

Awesome! Did you mention you "know" me from YarisWorld? Or at least say I know the dude with the custom center exit you guys did! Oh wait...they may charge you more. :biggrin: Let me know when you have a date and time and I'll try to stop by. :thumbsup:

[darkmoon87]

so much useful information in this thread...love it lol

[Herbicidal]

Awesome! Did you mention you "know" me from YarisWorld? Or at least say I know the dude with the custom center exit you guys did! Oh wait...they may charge you more. :biggrin: Let me know when you have a date and time and I'll try to stop by. :thumbsup:Psykobowler -well I answered my own question! On my way home from work today I decided to stop by All Muffler in Rocklin because of your post and both Mark and Bill said you're "a really nice guy!". They are looking forward to doing your system. :w00t: Once it's done and if you find you need it tweaked one way or the other, they will be happy to do it! They want you 100% satisfied. Heck, exactly the way it should be!

[Herbicidal]

I just brought my car in at All Muffler today. They quoted me around $474 for the longer imco muffler, dual exit 4 tips in the back. I am planning on getting it done in 3 weeks. I did not ask for a resonator after the muffler. They said since I will have a dual exit it will significantly quiet the sound.
Hey, just checking in. Are you still getting your exhaust done?

[GnomeBody]

All of the noise in my case is from 1500-3000 rpm, right where I do all my driving.

I had everything stripped out of my Liftback (backseat, spare, etc...) and one of the first things I noticed was how the stock exhaust seems to drone right at 2000 rpm. Cant hear it anymore now that everything's back in, but I told myself that if I were ever going to permanently remove the backseat or redo the exhaust, than a few pieces of strategically placed sound deadening material are going to have to go back there.

[bobolinko]

I had a custom exhaust . . . The vibrations are gone but the car is still so F&*@ing inside I can't stand it. Is there anything I can do to quiet it down, without investing too much more money? I'm in almost $500 and wished I never touched it to begin with. It almost makes me want a different car. :cry:

I thought of sound insulation, but would probably need so much of it I'd be better off buying the OE setup.

Any help would be appreciated.
I Did, like you, order a rather LOUD Axleback muffler and put it on my XD. I was oh-so-thrilled with the idle exhaust sound! Poking it out made a beeeautiful sound too... But highway drone was, like yours, INTOLERABLE. I kept changing back to stock every other week, and decided to try sound deadening the rear area of the car. I did the underbody, rear fenders, trunk floor, and paid most of my attention to the hatch area. I doubled the insulation on the hatch and rear panels near the exhaust and it was sooo nice, I ended up doing the ENTIRE car. The most effective dampening was foaming the empty frame areas and the fender cavities in the back. (Even the bumper) I now have the bad boy on constantly, and have no drone except when the windows are down. The Foam and "Rattle Trap" deadening was not very expensive. Foam was 4 bucks a tall can from Home Depot, and the Rattle Trap was $135 shipped. I used 8 cans of foam. I love driving it now, and my daughter says I made my own Lexus... :thumbup: