Thats just an old wives tale...mine has done well over 50k with K&N filter as have many others[:O] I did change my MAF recently as it was getting old but was still running fine.K&N filter + TDI turbo = failed turbo/MAF sensor.
Your standard intake system will be sufficent for what you're doing. If you want to make it bigger use a (assuming yours is a PD engine) PD130/150 intake with standard filter never ever, ever, ever, ever use a thiner than standard oiled filtration system on your TDI.
Never say never, we have had numerous threads regarding this engine, one of which became the sort of official one with 6/7 pages of info and included it did mention that the 270hp cup cars that vw raced (i think, not 100% accurate but a quick search will confirm this) were based on the AGR engine with heavy modifications to make them fire out 270hp..216 injectors from the T4 van, remap. best mods. plus perhaps egr delete, K&N filter and intercooler. The 90bhp is seriously restricted though, powerwise. You will never get more than around 130-140bhp out of it.
try and insure one at 18 !sell it and buy a 1.8t
Thought so... So how do u fit a 3 bolt pd turbo onto a 4 bolt system ?There was 4 bolts from the downpipe to the turbo on my agr