In my opinion its not just the tune . Its also quality parts. Dont skimp on fuel delivery or other key parts then you can tune with cushion. I installed my SC when I had just under 2000 miles and havent looked back. I have made changes and continue to but After 32,000 grin filled miles I have full confidence taking it on a romp or across the country.
I do plan on forging my spare motor and installing it because I feel Im at the threshold of what is considered reliable. I then will be going down to a 3" pulley.