here is a small paragraph taken from our sponsored Cobalt SS forum. "Alright, so first off ill start off why I used it. 2008 hhr 2.2 fully built, 60s, walbro 255, tvs 2.6 , header downpipe , methanol 10gph and a custom Cai routed behind bumper cover.... Well first off the intake is a 3in but the car was getting to much bypassed air, so we had it go down to a 2.5 where the maf was. Well that still had skew trims, and would never get the correct percentages. So i asked the owner of the vehicle to purchase a 2.5 air straightner from treadstone so I can get unskewed trims. So I had him purchase it. I assumed id be able to get trims down within 3 logs. Well ill put it this way from the base to now its taken 1 to get trims at 6% from 18% which it would have taken me quite a few logs without straightner..... So i highly recommend it to anyone..... Ecspecially if you are a full on custom build." Click Here For More Info!