Are high flow cats louder than stock cats?
02-01-2008, 10:28 PM
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Are high flow cats louder than stock cats? I just got TD's put on my 99 Z28. The new 2 1/4" piping starts right after the stock cats, back to Super 44 Flowmasters and dumped before the axle. There is an H-pipe. The thing is barely louder than stock...can't hear any of the flowmaster tone! Is this because of the stock cats, and would a high flow cat improve the sound at all? I'd like to keep this car legal, so removing or gutting the cats is not what I really want to do.
Last edited by SS14PSI; 02-02-2008 at 01:10 PM.
02-01-2008, 10:57 PM
#3
Yes, when I was in the process of trying to perfect my sound after installing LT's, Tim and EAD told me that the high-flow spun metallic cats wouldn't do much to quiet rasp, and recommended the old style Carsound cats. The higher the flow, the less sound conditioning.
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02-02-2008, 01:15 PM
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The D side cat is clear up on the manifold. The P side cat is not much further back. They are both located in a position way before the Y pipe comes together, so we started the new piping right after each cat. Maybe I can snap a pic today if that doesn't explain it well enough.
02-02-2008, 04:17 PM
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Could it be the mufflers? Someone told me that the Super 44's are very quiet, yet Flowmaster says that they are the most aggressive sounding muffler they've produced???
02-02-2008, 06:08 PM
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I would think the 1 chambers are the loudest and most agressive of the flowmaster mufflers. Switch over to them and i should add some volume. Much smaller and less restrictive than the 44 series.
02-03-2008, 11:08 PM
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Still wondering just how big the sound difference is between stock cats and high flow cats. I did some searching and it seems as if the HF cats do allow more sound but I'd love a before and after clip before I spend the $$$ on them.
