has anybody used the haltech platnum sport 1000 plug and play engine management system on there s4 n/a? what did this do for you? Is it hard to mess with?

 

Its probably the best thing you can ever do to that car. PERIOD. 2nd best thing you can do to that car is ditch the stock electronics and wireing harness. PERIOD. either way, its a lot better than a ******* rtec.