well guys about a month and a half ago i installed the stillen airbox& z-tube
i loved it....today i just finished installing the Stillen cat-back single wall dual exhaust.....i gotta say the tone is great....dont know if i can feel any difference by seat of pants or maybe it just feels faster b/c of the exhaust note......but i must say, its a perfect fit, not too bad install, and sounds and looks great...well worth it...(the fact that i picked it up used for a low price helps too)

 

Congrats. I have an HKS but was very close to buying Stillen. Great choice.