just wondering if any of you have either one. i was reading on the wbody 26" resonator. their price seem fair, but im not sure if it would do the job to stop the raspiness and drone noise. on the other hand the zzp is 28" and little more expensive. they both seem to do the same thing, quiet raspiness and drone noise. i can't decide which one is better for my car. someone reccommend me glasspack, but i don't think that's good idea for my mods. give me some feedback.