Vitesse without a doubt. John's customer service and products are simply amazing.

 

anyone mentioned Vitesse...oh, they did already.

 

Sorry if this is a repost. www.vitesseracing.com

 

I run my Guru map kit on a standard Vitesse chip.
It runs alot better. And its not even made for my application.
Imagine how good it works when it is.

 

Vitesse hands down the best.....You won't be sorry ..You can find cheaper you just won't find anything better believe me I tried....Weltmister ($120) Junk grade F... Authority ($750) Really Bad Junk grade FFF++....Devek...($250) good grade C+ ....Vitesse ($1800) outstanding grade A++ worth every penny.
253 RWH and 27+mpg at 70-85 MPH with a bad clutch and tired leaky oil burning motor this is no BS...
I won't even comment how bad the others where..