Audi 70 mm vs. Stock GTI Throttle Bodies

70 mm Throttle Body Test

Background: After finishing the tune for the Mabotech M520 turbocharger, I decided to see if there would be any benefit from replacing the stock GTI throttle body (TB) with a larger one. A search on eBay turned up an Audi A5 throttle body for $36 – a low enough cost for an experiment with a

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Mk7 Stock DV Piston

Stock DV Check

Background: While working on a recent turbocharger swap, I examined my collection of diverter valve (DV) parts and noticed some unusual wear on the stock DV piston. Compared to the new OEM DV that I have, this used one looks rough. I do subject the part to higher temperatures than the stock setup generates. As

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