Got these a while back but did not install them until yesterday. Drove the car about 50 miles. The muffler sound increased a bit as well as a marginal enhacement in performance. I've decided to go with high-flow cat pipes as I live in an area where emissions are required and I don't want to be having to change these back and forth every year (yes GA requires annual tests). BTW fitment was excellent. Paid over $400 for these but you can have them shipped to your house for $350. If they don't sell here I'll put them on ebay next week.
Follow Ups
Stainless Steel Specilaty Z Test Pipes - Jmartz08:13:46 01/07/07