If you want big horsepower to show off to your friends clear the second season then by any car that could race the 90's event fully modify the car because neither of the cars will be fast enough. So race the 90's event and come in first then you will win a Ford GT 90 and the standard horsepower is 719 then fully modify the car and it's horsepower should be 900-1100 plus if you still don't have a turbine step 3 race the monster B event and you will get it and that will get you to 1200-1400 but even if this car has a lot of horse power it will still lose in the drag races but it does pretty good in the other races it's usually the acceleration that doesn't do to good but you'll have fun.
Submitted by Brandon Hammond
If you don't think that the little testing wring is enough, after you've bought your car and you want to test it, go into quick battle and single player. Go to garage and load your career then choose the car you want to test. Then choose a track (Iron City Circuit is a good one) and select two laps and very easy.
There you go, an easy way to test cars to their potential. (for testing two cars just do the same except select dual battle but you must have two controllers)
Submitted by Jaffa of the SpornEX