Just installed my 2525's two days ago and i think i'm finally getting used to how LOUD they are. I couldn't believe the difference between these and the flowmaster super40s, i say the sound has increased ten fold. The first time i heard them on my car it was still on the lift at about face level and they almost knocked me on my ARSE! no lie, they were scary loud and i don't have LT headers or shorties on my car. I just have the second set of cats removed, 2.5in pipe installed from there back leading up to the 4in res delete tips, i can guarantee you that i'm the LOUDEST thing on the road....until DOOM shows up :coolman: lol