Yes, but the most interesting effect headers had for me was the change (raise) in RPM of peak hp and torque. Mind you, these were with Sanderson headers with 2-1/2" collectors. There are less restrictive headers out there with larger collectors. When I put the stock manifolds on, and made a run I was shocked to see the numbers were already peaked and on their way down from the lowest servo setting! The nailheads peak torque RPM was lower than the dyno was used to! By the way, the BNH2 Sandersons I used on the dyno are for sale. They still have the 1/4" EGT holes in them if someone is planning on a dyno session- or they can simply be welded up. $250 obo plus shipping. Erik
