Yeah you need time to get used to them, but if it is still loud, then I'd say that getting rid of the test pipes for the high flow cats should decrease sound level... BUT.... they will still be loud...
I put my stillen CBE in and the berk hfc's (using a temp gasket because the proper ones weren't in the box) and this is still loud lol I'm getting used to it but it definately is not like just a standard cat back exhaust. Now from what i heard and read about the exhausts, the FI cat back is actually louder than the stillen, so if mine is loud with cats then I'm sure yours will be a bit louder on top. Do you know anyone who has the cats installed? or did u all get test pipes. Would be good to hear it first...
Videos on youtube etc are of no help in my experience...
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