Any by "tuner" you mean person or are you asking what is the best Engine Management solution? Either way there is no "best" of either. You question is beyond vauge so the more info you give,the better we can answer.
This is a discussion on best tuner? within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; What is the best tuner for a 05 wrx.. sorry im a newb.. just im not sure good brands for ...
What is the best tuner for a 05 wrx.. sorry im a newb.. just im not sure good brands for the wrx
Keith tunes my car.. I've also heard good things about MZM here in Austin, although you might not want to drive all the way across the country to get your car tuned, so knowing your location would help a lot towards getting a recommendation for a reputable tuner in your particular area.
Engine management. Sorry about bring vague. Like I know that Cobb is good but that's really the only brand iv heard associated with the wrx
OpenSource is free.. so that's what I would go with. That is, unless the person tuning the car only does Cobb.