I have a swap with a 5.3 bored .030 with flat top pistons on a starter tune from PSI for about 20k miles now. The one issue I have is I have to run premium or it will throw a knock sensor code. Is there anyone that is known for doing good email tuning. I know it wouldn't take much to get it dialed in perfect. Thanks.

 

Where are you located?

 

What tuning device are you planning on using to get tuned?