Hey guys...so I've kinda been wanting to put a cat back exhaust on my 04 gtp....but the only one in finding is from zzp...and it's close to $1000 for the darn thing...I think that's kinda outrageous for just a cat back ..does anyone know of any other options? Or have experience with the zzp and is it worth it? What kinda power upgrade am I looking at if any? I'm working towards the smaller pulley and few other bolt ons...but zzp telling me I need to do exhaust and other support mods first.