So I was looking at the TUNESPORT performance ECU tuner for my 03 Sedan. It said you could get a max gain of 30HP but I know there is low chance of that. Does anyone have any experience with this chip that could spread some insight about it? Even if I get 10-20HP that would be great. Also said it would boost MPG aswell. For $70 that sounds like hell of a deal.

 

The only thing it will make faster is money leaving your wallet. Don't waste your money on crap like that. Get a real Uprev dyno tune if you are serious about making more power.

 

Watch this video till about the 3 minute mark, guy does a pretty good job explaining what exactly they are and why exactly they DONT WORK.