Invidia Q300 Catback + Berk High Flow Cats installed.. disappointed..

m4a1mustang

Yeah, it's just a very crappy sounding exhaust to begin with (though some people like it.) It has a lot of rasp with stock cats so HFCs or test pipes are just going to amplify that effect.

Usually the cat-backs that do the best with HFCs or test pipes are the ones that sound the smoothest on the stock cats... take for instance the Stillen, FI, and most likely Berk CBEs. Those systems are very smooth and refined when bolted to the stock cats. If you want to be more aggressive while still sounding very good you add the HFCs or test pipes to that setup.

But if the CBE is raspy to begin with... no dice. It will probably sound like ***.

Your best bet would be just to swap the CBE out with something better.

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- Steve

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