I want to install a metallic core cat converter and a magnaflow muffler in my midpipe to control emissions, noise and boost creep. Today I went to a few shops around my area and most aren't allowed to install customer's parts, I suppose due to federal emission laws.

Anybody recommends a good shop that does custom work?? Around the Westland, Wayne, Canton, Belleville, etc areas.

Maybe Autowerks or Godspeed in Novi?