I'm considering getting my stock ecu remapped and narrowed it down to 2 tuners. Both use the ECUTek system. They are Renick Motor Sports which is in Fullerton (http://www.isrperformance.com) and GT Motorsports in Ranch Cucamonga (http://www.gtmotorsports.com). Renick does not have a dyno and they just have the predefined maps that they load up. They said that they'll charge $775. GT Motorsports doesn't believe in the predefined maps and start from scratch and tune the car up on a dyno. They charge $1050. My question is it the extra $275 worth it to get it tuned on a dyno? Has anybody had any experience with the two tuners?