Les,
I was just posting the exh that was used when the headers were dyno'd with the headers installed both open no exh and the stock minus the 1st set of cats........the stock log manifolds were on the car when I first removed the cats and yes the hp gain was about 8hp at the time but when installing the shorty headers the hp gain was nil with the same setup over the log headers. So the same 8hp was there for both the shorties and log exh manifolds with the cats gone and the 11hp gain with no exh was the same for the stock and short headers. Sorry for the confusion. I just expected SOME hp gain even 4 hp would have been nice.
Robert