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Auto Racing/About exhaust pipe please...

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Expert: - 11/30/2007


Question
Hi, I have a stock 1997 jeep cherokee 6-inline 4.0L engine.
I want to make my engine breathe well :) so it will be faster.. What should I do to my exhaust pipe and tail pipe ?? increase diameter or decrease ? I want to do it in a welding garage.. Thanks.

Answer
There a couple of things you can do. First is get a low restriction air filter. Second, see if a throttle body spacer is made for your application. Next I would look at replacing the cat with a performance free flow unit. Then I would install a bigger diameter cat back system that includes a performance muffler. Dynomax has these kits and they won't break your budget.
Hope that helps. Let me know.

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Matt Lyons

Expertise

I am considered an expert in drag race chassis construction and tuning. I also have general knowledge of performance engines with small block chevies being my specialty.

Experience

I have worked in the automotive aftermarket as a builder, designer and seller of race components. I worked for Moroso Performance for seven years as an engineer and product manager. I currently am the owner of Lyons Performance LLC, a shop that specializes in American manufactured race products.

Organizations
NHRA, IHRA, SEMA,ASE, Alpha Omega Theta Fraternity

Publications
Muscle Mustangs and Fast Fords

Education/Credentials
BFA-New York Institute of Technology, Marketing

Awards and Honors
1998 SEMA best new product Award -Racing Vacuum Pump

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