it depends on what your looking for, are you looking for just sound or power? They each have their ups and downs and will sound slightly different
if you pair a fast intentions exhaust with some high flow cats, it'll probably make it louder but it will not give as good of gains as if you add some test pipes. Test pipes will also make it louder but you'll get some better gains than high flow cats, you also have the option to go resonated or non resonated with the test pipes. you also have to worry about check engine lights with test pipes unless you get tuned but there are people out there who dont have tunes, have test pipes and havent thrown and CEL's. i didnt feel like dealing with that so i tuned my car.
I cant confirm cuz i didnt look too far into this but another option is long tube headers and i have heard you get decent gains from long tube headers as well, it will definately be louder just like the test pipes, maybe even louder than test pipes but like i said, i never really looked into them.
others will chime in shortly. Im hoping to get my car re dyno'ed so i can see my new numbers with my ART pipes and FI TDX CF CBE, personally i love the sound i have and the power is more than enough for me for now.
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11 SR 370Z Sport 6MT - Sold
03 Escalade AWD - Sold
13 Silverado LTZ Z71 Crew Cab
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