The Labree cat-backs from Specialty Z are some of the best in the market in both quality and flow. My personal favorite is the Duel tip sebring system listed on the website. Adrian should be getting his within a few week so I'll let you know from personal experience soon. Once my TT build is done and my money is freed up I'll be switching to it also. The only other serious contendor to the Labree is B+B, but its WAY more expensive and dosn't look to flow as well. Both exhausts have a hardcore following. It all really depends on your tastes and your wallet.