Some interesting stuff we are finding out. The Stillen intake kicks ass over others we have tested so far, by 10 hp if the bumper is off. Stillen needs to make bumper vents to make sure their intake gets cold air. With the bumper on, it acts like the JWT POP, 2-3 hp way at the top of the powerband.
The Beck high flow cats smoke the Stillen parts by around 10 whp.
Look at a more detailed article soon, I need to review the data carefuly.