We have toyed with the stg 3 MPG Max kits and they seem to work really really well! On Aden's truck... he picked up about 2 mpgs... thats with a bigazz 64mm turbo and about 8psi of boost. I have them in stock ready to ship for $950, that includes shipping!
2mpg for almost 1k? i would suggest a AIS system before that. alot cheaper and user adjustable for were it turns on. AIS is still $$ but it would take forever to be worth the $$ put out using a $1k kit