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https://www.onlyrevo.com/blog/400bhp-van-the-hybrid-turbo-vw-t6-tsi-track-weapon/
Is this what you seek ?
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Literally tonnes of stuff within the VAG parts bin (your gonna want a TPS account) will bolt right on given the right number of hours trawling parts fiche and forum knowledge banks.
Shame the TSI has been pulled from van duties, wonder what they use in USA/AUS as both of those countries seem to favour petrol in that type of vehicle?
Only two experiences of it were in my old A3 1.4 TSI (140/150ps?), did everything you want except go fast, very quiet and drove almost like a diesel until 5k, then kept going, but even from brand new liked to drink oil at a rate I've never had on any car (even those that are visibly leaking it). Family had an EOS with a 1.4 tsi (slightly different version, think it was only 120ps) and was fine until 60k, then... timing chain tensioner, injector, injector again, and then at 70-80k, top end engine noise/wear. Despite only VAG service using the exact right oil every time and at considerably better than the crazy 'longlife' recommended service intervals (28k on one of our cars was 'correct'!!!???).
Also heard they like to eat bottom end bearings on occasion, so maybe its that, the guts of it aren't upto the task of hauling around 2.5t+ of van.
Engine - RS3 T5 unit
Gearbox - 7 speed DSG
Diff - I think 4Motion is a Haldex?
Brakes - whatever the fast(er) GTi's use
Discs - as above
Wheels - Amarok 18" steels
Tyres - winter tyres, maybe Michelins
Springs - Billstein B14 are the ones I see talked about, I'd quite fancy air, so high on fire roads and low on the autoroute
Dampers - as above
Seats - stock, rotating captains chairs
Infotainment system - stock CarPlay headunit with Morel amp and speakers
Trim and lining - stock(ish) front, fully sealed wet room rear pop-top, etc