2k1saleen

OK, so I took my car to CarbConn in Kirkland, WA and they tunned it up and it runs alot better but still feels like is missing power... heck, I had way more power before I swaped the stock heads to the MMR's which they were supposed to give me around 35-40HP more. The Dyno shows that I only have 200.78 HP and 248 TQ it does'nt make any sence because when I bought it was bone stock and it was making around 275-290. Am I doing something wrong? anyone knows why the loss in power?

cliffyk

200/248 is pathetic--a dead stock '01 GT will turn 220/260 or so.

Assuming the tune is good, with AFR and timing being what they should be, I would get rid of the 78 mm BBK TB/plenum and put on a 70 mm TB with an aftermarket plenum. With the better flowing heads that big TB may be slowing the charge velocity to the point that the intake as a whole is not breathing well at WOT.