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I'm currently building a bullet proof 1JZ, and I ran into the following problem; Maybe there is someone who actually put dual valvesprings in a 1jz head, and 1mm oversized 2jz valves, (because this is not a 'drop in') could help... So first of all 2jz valves are different. The 1jz exhaust...

As in the title, my 7m stutters with boost. I have done the lexriemer upgrade, with afpr and have a ugraded ct26 with a 50 trim. After doing this mod the car ran perfect @ 18 psi, but now it starts to stutter when the boost comes in (@ approx 4,5K) I also have the AVCR, and when I turn the...