The dyno guy doesn't have an exhaust system other than the cobbled up pipes I provided (X-pipe vs H-pipe, etc) so there's no way I can do that comparo. All they had were headers for my engine.

Concerning the 70 style manifold, I don't have an EH'd pass side 70 manifold but I do have a stock one. The problem is that they are going to charge me for extra time in changing out parts and I already went out of pocket to do the EH vs non EH test that I did primarily to get you guys a real world test/answer. If anyone wants to pitch in $150.00 I will send over my 70 pass manifold off and have them compare those vs stock 71's as well.

This is the stock set I just gave them.