i just have the flowmaster 40 series and a tip and thats all. stock piping. it take a while to break in. you can smell it when you get on it then get out of your truck and you smell the shit in there burning out. mine was quite also when i first got it. but i burned the crap out of there and it gets louder as time goes on. mine sure has. plus i got mine back in may i thing it was. and it was hot outside the truck so it burn all the excess crap out of it. as time goes on all flowmasters get louder. so no need to worry just get on it a few times without getting a ticket and you will know what im talking about. you will smell it.
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