I have the old skool hks fon for my 88 s4 turbo II but i was thinking of buying the rtek7 2.1 what do you think??

 

rtek is not a true EMS, but it works. If you are not looking for the complete deal and looking to tune with all stock parts then rtek is a way to go. If you are looking at going more then stock you will want a real ems.