I purchased my upgraded exhaust system in complete kit form from Skandix (www.Skandix.com). Very simple to install and follows the same pattern as the original. Includes 2" pipe, pipe to header (exhaust manifold) with two outlets, and the necessary clamps, bolts, and rubber O-rings. Reasonable price and I really like it. The problem with simply having a custom shop do their own thing is that they sometimes deviate from the original exhaust pattern and this could get in the way of upgrades\repairs you may do in the future. Grassroots motorsports encountered this problem when they had a shop install a custom exhaust on their 142 project. As far as headers are concerned, I have heard repeatedly on this board that the FI exhaust manifold is as good or better than most aftermarket headers. That's what I converted to and I'm pleased with the results. Best of luck!