Did you remove the cat? We are talking apples to oranges with elevation here but I got 84 (didn't read the RPMs though- will next time but it was well north of 9300 I am sure) at 2800 ft.Lol, according to the experts you're wrong about the header and the slip on. I got 80 mph at 7700 elevation at 8700 rpm. Alba tune and header with stock muffler and clutch.
It was still pulling too. Probably 80 degrees out.
I am agreeing with you...not sure why you are arguing about something I agree with...header and muffler power.
Straight through muffler can is OBNOXIOUS...IMO. My brothers is obnoxiously loud. They way my car is running now- I am not going to buy a header as of now...we will see how it does in Glamis with paddles.
I was going to get the ALBA flash but Nate could not get it to me and would not sell it over the counter (Kommunist Kali) ...so I went with Speedwerx and am VERY happy.
I did not know you have an XX ??