I ran them all and I had the best luck with my 2.8H. I made more power my MPH was better at the track and my Iat's were cooler. I would not buy a 2.6H I would just go right to the 2.8H because it is only a few hundred bucks more than the 2.6H. I like the Whipple's 2.3 also but around 20psi on...