Why go for a GT30?
I'm just about to swap to a GT2871R and put in the internals as well. The response from the GT2871 will be better than the GT30 and give a better overall track/fast road car to boot. Regal are currently running over 450bhp with their GTI on a GT2871R
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Intercooler-wise you would need to change your stoock intercooler as the plastic end caps (Does the
K1 have the same as the ED30?) won't hold up to the extra pressures. This means either going for an S3 plus forge twintercooler (£800+ with fitting) or alternatively the THS intercooler, which is rated up to 600bhp and would cost less.
He'd need a high pressure fuel pump (Autotech, APR, KMD) and Regal also recommend uprating the in-tank pump too for higher bhp cars.
The APR RSC exhaust would give better results than the milltek as it has a 3" through system, plus has a 100cell cat as opposed to the 200 cell cat of the Milltek and so is less restrictive for output. The Milltek is good to though. Blueflame is another option with a 3" system and 100 cell cat.
Before your mate goes down the route of a big turbo, he needs to sample stage 2+ and also (and more importantly) have all the back-up modifications like Coilover suspension, ARB's, uprated brakes, Quaife etc to keep the car driveable.
