Ernie - I run a 2000 C5 ProMod Coupe with auto. I had your "Vortex Ram Air" on my car last year and averaged 1/8th mi. 8.120 / 86.59 and 1/4 mi. 12.664 / 109.92 (Best time 12.16 / 114.3). I put the "Vara Ram" system on this year (could not resist)and reluctantly gave up the cold air screens to do so. I was nervous about taking in water and debris through the nose ducts but I figured I would see a big positive result! Guess what! my averaged times went up to 8.170 / 86.28 and 12.752 / 108.11 (over 45 runs) so I switched back to cold air screens and YOUR STUFF! My times dropped to 8.150 / 86.03 and 12.685 / 109.32 (over 15 runs) KEEP UP THE GOOD WORK! John Reese Cary, Il. 847-490-9100 or sales@gladstone1.com