[Markoz28]

Originally Posted by JonDaddy82

Eeeeeeh, it's typical practice to make one pull before touching anything just to see what you're working with.

Some tuners load a base file, considering all the facts of the parts listed. This is more of precaution so that they dont blow things up because the cars tune was way off. Some tuners even with a base file, and after years of experience are within 10-15hp of the final numbers.