Well my problem is as stated, I cant rev past 5k at all even in nuetral. When I do, the motor lets off a huge backfire that sounds like a gunshot w/ a huge black puff of smoke to follow. The vac is at 15hg, timing is at 15 and tps is set at .45 exactly. My egt's at idle are 540c, 2k-620c, 3k-700c and 4k-800c. Anything past 4k it starts studdering and by 5k it pops. The "pop" is so powerful that it looked as if it knocked the rpms back down to 2k. It sounds like timing is being pulled and the explosion is happening in the exhaust manifold. My setup is a Gti-r in a classic with the JWT ecu with 9.1 wiseco pistons, swain coated w/ a t28 for now. Any help would be appreciated as I can only think of the knock sensor, bkr6e's plugs and .32 gapping or possibly fuel pressure as the only options.