Is there anyone running any type of fuel computer like apexi system etc... on the na S5 engine. And if so is it worth the while on the na. How much controal do you have and what hp gain vs stock. Or is this mainly a turbo only mod.
S5 NA full street port / stock manafold w race beat exhaust /

 

look into the Rtek 2.0 http://www.pocketlogger.com/index.ph...age=2&ecu=S5NA but ignore their rediculous horsepower claims.

also an oldschool SAFC 1 will do the job as well.

 

Thanks for the info. Going to try it out.