My Long Tube header build - Toyota Yaris Forums

xnamerxx · 12-08-2012, 03:46 PM

Nope no contact aside from the muffler hitting the heatshield at idle making a slight rattle noise. The noise in and of itself isn't from contact but mostly due to the location of the muffler. Behind the header is a cat, muffler, and turndown or side exhaust depending on how I want to run it. The muffler is tubing diameter is 2.25" and the tubing is perforated its a magnaflow. I've had the same behavior with all the mufflers I've used the small and large ones so Idk.

The exhaust is much louder at lower rpms and high load because its a low frequency and when the motor is screaming its a higher frequency. I think its partially due to how the cam timing behaves are high load low engine speed since there is a ton of overlap.

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12-08-2012, 03:46 PM	#11
xnamerxx 0-60 in slow Drives: light blue liftback Join Date: Aug 2009 Location: so cal Posts: 926	Nope no contact aside from the muffler hitting the heatshield at idle making a slight rattle noise. The noise in and of itself isn't from contact but mostly due to the location of the muffler. Behind the header is a cat, muffler, and turndown or side exhaust depending on how I want to run it. The muffler is tubing diameter is 2.25" and the tubing is perforated its a magnaflow. I've had the same behavior with all the mufflers I've used the small and large ones so Idk. The exhaust is much louder at lower rpms and high load because its a low frequency and when the motor is screaming its a higher frequency. I think its partially due to how the cam timing behaves are high load low engine speed since there is a ton of overlap.