The COBB test pipe is a replacement for the factory catalytic converter. Our test pipe will work with the OEM exhaust as well as any exhaust that would keep the factory catalytic converter.

Made of 304 stainless steel with a 3" diameter, the test pipe is available with a high flow cat or catless.

You might be thinking "What do SAE Guidelines have to do with me?"...

Well, if you drive on public roads, they have everything to do with you and your car. California regulations contain a number of sections specifying permissible vehicle noise levels. The bulletin advises that passenger car exhaust systems that comply with the requirements are deemed to comply with Vehicle Code enforcement, governing mufflers and exhaust system modifications. The exhaust noise provisions establish a limit of 95 dB measured 20 inches from the exhaust pipe outlet with the engine operating in neutral, at a specified speed typically between 3000 and 5000 rpm.  Exhaust system modifications are permitted to increase noise above the level of original factory installed systems as long as the 95-decibel limit is not exceeded.