it depends. my 9 1/2" was $600 if i remember correctly. sounds like a lot of money until you feel the results... whatever company you call just make sure your 100% honest about your combo and intended use of the car. it all makes a difference and can make or break the way the converter is set up for you. for example. if you do mostly street driving and only take it to the track a few times a year they will most likely make it a little tighter then if you were going to be at the track every week and want every last tenth out of the car. know what i mean?
