Hey everyone. Looking for some advice on an issue im having with my car. I have a 98 cobra with a 4.75 MMR shortblock, FR500 cam kit with valves and springs, IMRC deletes, C.O.P. conversion for the Holley terminator x standalone. The turbo kit is an On3 with a reworked y pipe on the hotside for better flow. It has a brand new Precision 76/75 turbo with a .96 housing. I have pulled the car back apart to verifiy the cam timing is correct and it is set to 0. Basically the car stops making power at 5500 rpm and starts to fall off. Even the fuel table on the Holley is pulling fuel. We are not finding any blockage on the hot or cold side. We reworked the y pipe on the hot side for better flow since the on3 dead headed into the other side as opposed to flowing up to the turbo. It still has the twin wastegates that have been upgraded to precision wastegates. Also hot compression we checked while on the dyno all cylinders are 182 to 190. Im curently at a loss and am wondeing where to go now. Most people are saying with a setup like this 700 to 800 whp is possible. We can only get it to 500 and then it doesnt matter if we add timing or boost the power isnt going up. The big thing that I dont understand is the car runs fine? All of the spark plugs look good there isnt one that screams dead cylinder of engine problem. Any input would be appreciated. Thanks