Quote Originally Posted by cherbi7 View Post
I have heard about the S5 setup and it is a good idea to change over to it but then I have to change my engine wiring harness and AFM to be in compliance with the rules right? I think something with the injectors has to be changed too...?
Thanks
No and No. Updating/backdating IS allowed on the spec line. S5 intakes run just fine on S4 harness and AFM. You are thinking of hign and low impedance injectors. Use the S4 injectors with the S4 wiring. They are all 460cc. Use the S4 TB. All you have to change is the UIM, LIM and plenum.