I am sure there is a thresold rating on all internal parts, APR is probably pushing well within the threshold. I would assume the only weakness of a pressurized engine would be the check valves and easily replaceble parts. I am sure APR is not pushing the limits of the engine.
Your "sure," yet VW/Audi engineers clearly feel otherwise.
So who's right - you or them?
Here, give post 1 a read:
http://www.golfmk6.com/forums/showpost.php?p=111329&postcount=1
APR tunes DRAMATICALLY increase engine torque (via increased boost levels), which results in equally dramatic increases in internal engine loads (e.g. pistons, rods, rings, wrist pins, bearings, main bearing caps, crank and block). Higher boost also increase loading on the cylinder head.
That's why VW engineers specify stronger versions of
ALL those parts for all 2.0 T engines that are rated at 227 HP or higher from the factory.
Yet, you think 254 HP - 361 HP (APR Stage 1 - 3) is fine for the base GTI engine?
Do you think VW/Audi go to all that extra effort and expense for nothing?