when I started tuning, I wanted some help, so I used the dhp to take scans and sent the data to Will at Overkill Motorsports and he made maf adjustments for me. He will also do the same thing with HP Tuners. His tune is far superior to zzp's. if you buy an hp tuner, I would just get a new one, so you don't have to worry about buying more credits. if you get a used one, make sure it still has credits. new units come with 8 credits, so you can tune 4 different vehicles, after that, you need another 100 dollars in credits per vehicle, and used hp tuners rarely sell for less than 350, often without any credits.
