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Old 08-19-2016, 12:56 PM   #1
man83
 
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Arrow ►►►Custom 2" Catback - What next? Please help

Well, last weekend I changed all the pipeline.
I deleted the 2 catalytics, and only conserve the resonator. I replaced it whit a custom 2" catback, it's direct from the headers to the muffler.

Now the car has:
• CAI with AEM filter.
• DC Sports headers.
• Custom 2" catback.
• Magnaflow 14805 muffler.

So... What else you recommend me?

I was thinking in the Nology hot wire, but I have only read bad reviews about them.
Other option is start to invest in handling performance like springs and bars.
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Old 08-22-2016, 08:13 AM   #2
echo-francis
 
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did you feel any difference with the custom exhaust?

and did you think about a lightweight crankpulley or 1zz throttlebody?
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Old 08-22-2016, 08:43 PM   #3
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i'd recommend installing a catalytic converter. first, so your car doesn't smell like old wet turd. second, because it's a FEDERAL offence to not have one on public streets. if some drunk slams in to you and rolls your car, the officer might notice the missing smog devices. just because you may live somewhere emissions tests are not conducted, it's still federal law to have one. a $10,000 fine and jail time may result. third, a high flow catalyst will only effect performance about 1/2 horsepower, but will create that much needed 1 psi back pressure.
this is just a friendly warning. do what you want with your car. it's yours.
i'd recommend: porting intake manifold and installing 1zz throttle body; rear sway bar; lightweight wheels; lightweight clutch/flywheel; suspention
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Old 09-08-2016, 12:09 PM   #4
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Quote:
Originally Posted by man83 View Post
Well, last weekend I changed all the pipeline.
I deleted the 2 catalytics, and only conserve the resonator. I replaced it whit a custom 2" catback, it's direct from the headers to the muffler.

Now the car has:
• CAI with AEM filter.
• DC Sports headers.
• Custom 2" catback.
• Magnaflow 14805 muffler.

So... What else you recommend me?

I was thinking in the Nology hot wire, but I have only read bad reviews about them.
Other option is start to invest in handling performance like springs and bars.
i had similar mods in the begining just like yours...
mine was smoother powerband after 2000rpm from exhaust system...and a slight push after 4500rpm...guess from intake? i was expecting much more..
your opinion? everybody has different butt-o-meter..😅😅😅

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Suspension: Hankook Tires, Performance OEM replacement Shocks & Springs F: 1.5 B: 1.4, Mu Spec brake pads, Front tower & Rear sway bars, Rays nut & lock
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Old 09-08-2016, 01:02 PM   #5
thebarber
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dude, we all breathe the air. put the catalytic converter back on.

lightweight or underdrive crank pulley next
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Old 09-09-2016, 01:06 AM   #6
invader166
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I'm with thebarber on both points.
Get yourself a lightweight pulley next. (Or an entire set if you wanna go all out) It will really frees up some torque, but will make the car a bit jerky, as the engine will be more responsive.
And yes, definitly put a high-performance catalytic converter on, so it doesn't reduce performance, but still conforms to regulations.
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Old 09-09-2016, 05:04 AM   #7
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Quote:
Originally Posted by invader166 View Post
I'm with thebarber on both points.
Get yourself a lightweight pulley next. (Or an entire set if you wanna go all out) It will really frees up some torque, but will make the car a bit jerky, as the engine will be more responsive.
And yes, definitly put a high-performance catalytic converter on, so it doesn't reduce performance, but still conforms to regulations.
just like invader166 stated...i went with lightweight pulley right after all your mods....you will gain slight tq and faster rpm reach 😎

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Engine: 1JZ Injectors, Header, Center Pipe, K&N Drop In, E85 Injector Converter
Suspension: Hankook Tires, Performance OEM replacement Shocks & Springs F: 1.5 B: 1.4, Mu Spec brake pads, Front tower & Rear sway bars, Rays nut & lock
Electric: Volt Stablizer & Multi gauge obd2
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Old 09-12-2016, 07:52 PM   #8
KenTK808
 
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I think you should ditch the aem filter and get a Apex'i world filter and convert to a short ram.
DC header is good
You should have gone with a larger diameter pipe for the exhaust. You should have felt a noticeable gain from removing the cats. The stock exhaust is really restrictive.

Suspension and brake upgrades are always a good choice.
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Old 09-12-2016, 09:56 PM   #9
man83
 
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Quote:
Originally Posted by echo-francis View Post
did you feel any difference with the custom exhaust?

and did you think about a lightweight crankpulley or 1zz throttlebody?
Yes, I noticed a big difference, now cutting rpm comes faster. Another change was the sound , now is very noisy, but I will install a Vibrant Ultra Quiet resonator.

All comments talk about pulleys, I think that will be the next step.


Quote:
Originally Posted by SirDigby View Post
i'd recommend installing a catalytic converter. first, so your car doesn't smell like old wet turd. second, because it's a FEDERAL offence to not have one on public streets. if some drunk slams in to you and rolls your car, the officer might notice the missing smog devices. just because you may live somewhere emissions tests are not conducted, it's still federal law to have one. a $10,000 fine and jail time may result. third, a high flow catalyst will only effect performance about 1/2 horsepower, but will create that much needed 1 psi back pressure.
this is just a friendly warning. do what you want with your car. it's yours.
i'd recommend: porting intake manifold and installing 1zz throttle body; rear sway bar; lightweight wheels; lightweight clutch/flywheel; suspention
Thanks, I already started to look for a high performance cat.
The 1ZZ TB is one of the most popular upgrades that generates good results. Just yesterday I bought the TRD Sway Bar and the Tanabe Tower Strut Bar.


Quote:
Originally Posted by rabbito View Post
i had similar mods in the begining just like yours...
mine was smoother powerband after 2000rpm from exhaust system...and a slight push after 4500rpm...guess from intake? i was expecting much more..
your opinion? everybody has different butt-o-meter..😅😅😅

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Hahaha! My butt-o-meter tells that the slight push is above 3.5K rpm, perhaps not having the cats on.

Quote:
Originally Posted by thebarber View Post
dude, we all breathe the air. put the catalytic converter back on.

lightweight or underdrive crank pulley next
Definitely going to install a High Performance Cat.
I think that the crank pulley NST calls me.


Quote:
Originally Posted by invader166 View Post
I'm with thebarber on both points.
Get yourself a lightweight pulley next. (Or an entire set if you wanna go all out) It will really frees up some torque, but will make the car a bit jerky, as the engine will be more responsive.
And yes, definitly put a high-performance catalytic converter on, so it doesn't reduce performance, but still conforms to regulations.
Without questions I'll buy the NST Crank Pulley.

Quote:
Originally Posted by rabbito View Post
just like invader166 stated...i went with lightweight pulley right after all your mods....you will gain slight tq and faster rpm reach 😎

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Excellente! That's what I need.

Quote:
Originally Posted by KenTK808 View Post
I think you should ditch the aem filter and get a Apex'i world filter and convert to a short ram.
DC header is good
You should have gone with a larger diameter pipe for the exhaust. You should have felt a noticeable gain from removing the cats. The stock exhaust is really restrictive.

Suspension and brake upgrades are always a good choice.
I had the same thought after having installed the 2" pipe, I would have liked a 2.25".
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Old 01-16-2017, 11:59 AM   #10
NJP440
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I had a 2&1/2" custom stainless catback made from the second back straight to the muffler deleted the resonator and it came out pretty decent. I also have installed the Whiteline rear swaybar, tein coilovers, UR rear upper brace, and megan racing c pillar bar (useless I know It's just for looks lol)
I'm definitely impressed with how my car performs and I'm excited to throw on the 1zz throttle body I've had sitting in my closet for a year and a half lol



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Old 01-16-2017, 11:55 PM   #11
man83
 
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Quote:
Originally Posted by NJP440 View Post
I had a 2&1/2" custom stainless catback made from the second back straight to the muffler deleted the resonator and it came out pretty decent. I also have installed the Whiteline rear swaybar, tein coilovers, UR rear upper brace, and megan racing c pillar bar (useless I know It's just for looks lol)
I'm definitely impressed with how my car performs and I'm excited to throw on the 1zz throttle body I've had sitting in my closet for a year and a half lol

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Nice sound. I had to change the OEM resonator to this one of 24".
The sound improved a lot and I did not lose the power I had gained.
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Old 01-17-2017, 12:00 AM   #12
NJP440
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Quote:
Originally Posted by man83 View Post
Nice sound. I had to change the OEM resonator to this one of 24".
The sound improved a lot and I did not lose the power I had gained.
That's nice! What's the inner diameter? What brand? Looking to possibly quiet mine down a little lol

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Old 01-17-2017, 12:02 AM   #13
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Quote:
Originally Posted by man83 View Post
Nice sound. I had to change the OEM resonator to this one of 24".
The sound improved a lot and I did not lose the power I had gained.
good to see somebody kept on going with their project...i will update mine with fuel injection(E85) ecu tuning soon 🖒🖒🖒🖒

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Suspension: Hankook Tires, Performance OEM replacement Shocks & Springs F: 1.5 B: 1.4, Mu Spec brake pads, Front tower & Rear sway bars, Rays nut & lock
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Old 01-17-2017, 12:44 AM   #14
man83
 
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Quote:
Originally Posted by NJP440 View Post
That's nice! What's the inner diameter? What brand? Looking to possibly quiet mine down a little lol

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The inner diameter is 2", this is custom made.
A friend recommended a vibrant, and I was about to install a Magnaflow Glasspack.

Quote:
Originally Posted by rabbito View Post
good to see somebody kept on going with their project...i will update mine with fuel injection(E85) ecu tuning soon 🖒🖒🖒🖒

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Tanks man! I'm loving the process.
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Old 01-17-2017, 12:46 AM   #15
NJP440
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Quote:
Originally Posted by man83 View Post
The inner diameter is 2", this is custom made.
A friend recommended a vibrant, and I was about to install a Magnaflow Glasspack.



Tanks man! I'm loving the process.
I was referred to go magnaflow I'm trying to keep an even 2.5" the full way back but I definitely need something a little quieter before I get pulled over

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Old 01-17-2017, 01:16 PM   #16
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Keep in mind that you can lose some low-end torque if you go too wide with the exhaust diameter.

Quote:
Originally Posted by thebarber View Post
…lightweight or underdrive crank pulley next
I vote for the underdrive pulley. It will also be lighter weight :-)


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Old 01-17-2017, 04:17 PM   #17
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Quote:
Originally Posted by NJP440 View Post
I was referred to go magnaflow I'm trying to keep an even 2.5" the full way back but I definitely need something a little quieter before I get pulled over

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If you're keeping your engine NA then don't go larger than 2.25".

I decided to take the advice of a reputable and very good exhaust shop against the advice of some of the experienced YW members and I lost noticable torque. Had the shop re make a 2.25" and most of the torque came back and still has the increased top end.

That was with all the flow mods -dc header, MI intake manifold, intake, 1zz TB.
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Old 01-17-2017, 04:25 PM   #18
NJP440
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Quote:
Originally Posted by tmontague View Post
If you're keeping your engine NA then don't go larger than 2.25".

I decided to take the advice of a reputable and very good exhaust shop against the advice of some of the experienced YW members and I lost noticable torque. Had the shop re make a 2.25" and most of the torque came back and still has the increased top end.

That was with all the flow mods -dc header, MI intake manifold, intake, 1zz TB.
Ya mines getting boosties 😈 GT2860RS with custom tubular manifold and Haltech standalone. I'll post more on that as I progress. As for now I just have a closet full of parts just waiting on the money to purchase the rest of necessary parts.
Only reason I opted for 2.5"

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