So I bought a 2002 wrx wagon from a friend. It has a Jdm engine with swapped drivers side intake cam gear and crankshaft gear with the Usdm ones, unequal length headers catless up pipe and catless down pipe, Greddy BOV, and a Perrin high flow filter, and a stage 2 tune. When I do any pulls as soon as I hit 5k rpms it stops pulling. there?s no CEL to see exactly what?s going on with it. Any help would be greatly appreciated.