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I'm using kupp stage 3 in my turbo GTi. So far so good at 15psi. It has a good price on ebay.
The only issue we encountered while installing the kit was that the center of the clutch was a bit thick and the fingers on the plate were touching the center. But I think the problem was on my side cause of a misalignment on the clutch cable to the adjustment arm on the gearbox. We did grind the center of the clutch down near the springs.
On my NA GTI I'm using stock clutch plate and stock M15a pressure plate. So far so good with a lot of revs.
_________________ 1991-GTi: JE 75mm 11:1 pistons,Ported head, Single UD pulley (OCC),Sandros chip,Aluminium flywheel,3tech 222/365 cams, Cultus headers,Cultus IM,50mm tb,Crane cams adjustable cam gears,Apex suspension, 4.39fd GB. 1989-GTi: 3Tech 210/340 Cams,Cultus IM, B&G springs, TD04L turbo, Apexi SAFC, Suzukird UD pulley, Circuitse7en dual boost controller, AEM wideband, AEM water / meth injection kit, HKS bov. 2001-Altezza AS200: Stock.-sold 2003-EVO7 GT-A Aruba "one happy island".
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