I have an Envi green XR6 NA MkII and ive got a full stainless steel xforce 2 1/2 inch system, growler intake with K&N big mouth pod filter, and a 25% underdrive kit and without a tune its making 159.6 RWKW and 444.4 Nm of torque on 98 Octane, at 4000 RPM in 3rd it has a slight dip in the torque curve due to it being untuned and exhaust flow is different from the stock exhaust manifold to the extractors, but but all that was about $3.900