Hey guys, thanks a lot for the links they were really helpful. My main goal with the car is to have a nice weekend cruiser for car shows etc...... but also want to kill some ricers and mustangs (long standing grudge) in a little light to light action, no really hard cornering though. From the calculaters view it looks as though I'll go with 3.9, does that sound about right for what I'm wanting to do? I never really was a math with. Thanks again.