[flowking]

Yes they do Kirkham. All I can compare the quality to is that of a Burns Stainless product. You can get them with true merge collectors or the basic swedged 4 into 1, and yes they do make more power than the standard Cobra version where the four primaries are rolled into each other creating a nice area of constipation for the exhaust to bang around rather than creating a scavenging effect. I believe they have tooling and do not need the car.