When I went to the shop we talked about removing a drive shaft, but they made some calls and found a dyno a few miles away they could use. Thorley several dynos in the main facility but none for full time. I think a bunch of us should dyno these things with various combinations separatley. I would like to see the test sheets on stock versus new headers, cool air kit, new muffler w/and without resonator, etc... If i can be there I may have them run a seperate test before and after without my airfilter just to see what happens. Once these headers are ready everyone should report back and post the #'s from their local shops.
The only other upgrade I plan after headers will be a new Magnaflow muffler. My local shop told me that the resonator is not restrictive at all and can be left on. The muffler on the other hand is fairly restrictive.
Did you complete the Dyno run yet? If so, how did the headers perform? Did they sound good?