i have a s4 with less than 30 k on motor. and a blown s4 t2 motor. i am good at fixing things but not anything aftermarket. hopefully i dont get burned.

the turbo2 blew cause of no oil pressure.

questions are simple

if i use the t2 harness and ecu, will the rtek 7 (using the t2 ecu)work for it still. i am guessing yes cause you tune yourself right.

what wideband should i go with and can it work with the rtek. or should i go piggy back fuel control.

i am new with turbos, i am using the stock turbo until i learn more.
if i use the stock turbo, what exhaust size should i run, i work at CarX so i can build my own. should it be wide open or somewhat small.

i was also going to either top mount and have some kind of 02 cooler on it or front mount, using exhaust tubing.

i want an effiecient and reliable bov and wastegate. but a budget of 300 for both.