Well ive been running around with a mandrel bent 3 inch to an 80 series muffer no cat, with dual 2 1/2 inch tips. real loud, real bad drone on the freeway, scares small children, gets cops attention real well...anyways, today i removed all that and put a 3 inch force II system (3 inch single from cat to 3 inch 30 series muffler to 3 inch single exit on drivers side)...woah my *** what a difference, my car is so quiet now. I know most people on here want an "in your face" kinda noise, but i like being a little more invisible....oh also i had twin chrome megs jutting out about an inch under the bumper on each side, now you cant see ANY exhaust.....i like stealth.

 

I have the same exhaust on my Z,second time now.Had it on with my old motor but removed it to install Random Technology cat back with new motor,needless to say I went back to the Force 2.It does get louder as it breaks in,but I run no cat so for me it is a bit loud with my motor and headers..SLP 1.75".I am not exactly happy with the single pipe but I will gladly trade a better flowing exhaust versus a crossflow style with dual tips.