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Hi guys, the time has come to think about where my bottle necks are in my set up and what to touch next. Currently i'm as follows: RB26/30det with all the internal goodies Ported head, 270 10.8mm lift cams and all supported head mods Aftermarket inlet mani with 90mm TB all match ported etc Chinese 600x300x120 cooler (bottle neck?) 3' plumbing all the way round 3.5' down pipe that goes to 3' just past passenger front seat (bottle neck i suspect). 60mm Turbosmart progate EFR8374 1.05 You will notice on my dyno sheets that it starts dropping off just after 7k. On the high boost run, my tuner tried to feed more boost after 7k but it didn't do anything really. I had a shaft speed sensor installed but didn't realise i needed a speed scaler so I don't have any shaft speed figures unfortunately. I suspect i have some sort of breathing issues or my turbo is maxed out? Does the RB30 just not want to rev any more than 7k? Wonder how that EFR9174 would go