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Old August 3rd, 2015, 05:58 PM   #1
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Best exhaust setup???

Is there a definitive answer yet? I've spent weeks reading and can't find dynos to prove anything 100%.

The consensus seems to be 3" piping either single or to a dual 2.5". Jiga put down the best numbers yet with a 3" single and cams. For those of us without cams, we are told there is no drop off in low end torque vs. 2.5" piping, which flies in the face of traditional exhaust building knowledge for engines of our size/power.

Dom recommended I use a true dual setup with an x pipe but that seems scarce and unproven, not to mention cost, weight, and complexity with high flow cats.

Some slightly off topic questions pertaining to my car:

I need a high flow cat to be STX legal for autocross. If you have a high flow cat, is a resonator still necessary to keep sound levels down? I still daily the car so it can't be stupid loud.

Is there anyone that makes a 3" to 2.5" mandrel bend kit for our cars? All I can find is 3" to 3" after the y and that seems suboptimal.
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Old August 8th, 2015, 06:43 PM   #2
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Yeah dumb question from a "vet" maybe but I would still like to hear opinions.

I'm currently set on a 2.5" to 3" reducer, 3" high flow cat, 3" resonator, and the 3" to 3" after y mandrel kit with two random mufflers unless someone can talk me off of it.

Is anyone running a cat after the jpipe? I'd like to know how it sounds with or without resonators.
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Old August 8th, 2015, 11:39 PM   #3
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Originally Posted by CBUS-AV6MT View Post
Is there a definitive answer yet? I've spent weeks reading and can't find dynos to prove anything 100%.

The consensus seems to be 3" piping either single or to a dual 2.5". Jiga put down the best numbers yet with a 3" single and cams. For those of us without cams, we are told there is no drop off in low end torque vs. 2.5" piping, which flies in the face of traditional exhaust building knowledge for engines of our size/power.

Dom recommended I use a true dual setup with an x pipe but that seems scarce and unproven, not to mention cost, weight, and complexity with high flow cats.

Some slightly off topic questions pertaining to my car:

I need a high flow cat to be STX legal for autocross. If you have a high flow cat, is a resonator still necessary to keep sound levels down? I still daily the car so it can't be stupid loud.

Is there anyone that makes a 3" to 2.5" mandrel bend kit for our cars? All I can find is 3" to 3" after the y and that seems suboptimal.
If I remember correctly I gained 12 whp from the custom dual exhaust, still using front TL-S stock cats and still using rear stock TL-S mufflers. Sounds amazing... and oem quiet at normal driving mode and sounds very good under load... best mod so far
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Old August 11th, 2015, 02:48 PM   #4
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gained over 20whp on my setup, full custom from the heads back, 3' to a 5 inch megaphone
thisaznboi88 and Atlas.46 like this.
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