I am looking into rebuilding my s4 na soon, because of its fog machine property, and I am considering putting s5 rotors, front counterweight, aftermarket rear counterweight, lightweight flywheel, and stronger cluch. Can I do this on a stalk ECU? Also how will this effect emissions?

 

As long as the counterweights match the rotor generation, you should be good to go. AFAIK using the stock ECU shouldn't be a problem, but I've never used this setup...

 

im going to be running s4 na rotors in my s5 t2 setup.

 

why not s5 na rotors in your s5 t2, s5na rotors are lighter and higher compression then the s4's

 

where is kevin. explain. im not retyping it.