I hadn't actually done anything to mine, but yes a stronger spring was going to be tried when the new motor was due to go in. I think an external gate would be really beneficial for running higher boost on the VF twin scroll turbos, as the internal gate doesn't really look ideal. The TD twin scroll exhaust housings look much better. It would be interesting to see how much earlier you can get a 36 to spool over a 37, as mine used to spool damn fast, and that was without AVCS.

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