I have a stock MCS auto 2009. The turbo just baked and seized. I'm going to remove the CAT (part of the cause) and have the turbo rebuilt. If I go with the hybrid k3/k4 turbo do you guys think I will be in danger of damaging the car if I leave the car bone stock with the exception of the CAT delete. Also without a tune or an intercooler upgrade will I still see an increase in performance? Bottom line can I upgrade the turbo and run the car without a tune and any further modifications reliably and safely.