Hi guys having an issue that's got me stumped so just after some advice or ideas. Motor is basically stock besides the greedy front facing manifold and a front mount, over the past week we installed a after market exhaust manifold, hi-flow cat with a 3 inch system from the turbo back and a 2 way diff now we have lost power dramatically the car was running 10psi fine before on the standard ecu now it won't go over 8psi and it drives like the timing is out or something could it just be in need of a tune after the upgrades or would it more likely be another issue somewhere? Any advice is appreciated thanks