Last week for ***** and giggles I decided to remove the cat and run the car open header for a few hours, just to see if I felt a difference and also to see just how loud it would be. And it was LOUD. I did feel a lose of power down low but up top I couldnt really tell if I gained anything because the noise was very deciving. Does anyone have dyno sheets for their h22 with bolt ons running open header ?

 

my dyno is through a cutout, which is 6" and a 30 degree bend away from being open header