Eric,
Thanks for posting the dyno numbers. Some may argue that the 20HP increase is not a lot considering the cost outlay, but it's a combination of the factory mufflers and the
headers that really rob the power on a Superformance. I will probably tackle the headers next year (there are offerings out there that smooth the bends exiting the exhaust ports). Or I might just take my old ones to Alex and tell him "Here, improve these, will ya?!?"
I posted my fabrication shots in my previous thread...take a look when you get a moment.
-Dean
P.S. The I.D. on my stock Superformance mufflers was 2.0" exactly. Are you working on a new model...perhaps they increased the I.D. slightly since more and more owners are installing big blocks now?