just purchased a pipercross unit off ebay for $100 shipped from england... i understand the whole upsetting the maf thing with a bit of oil... but honestly dont you think the turbo spits a little tiny teeny weeny amount back out that way anyway? i have the part numbers if anyone is interested in them for the three leading brands: Pipercross PP1599, K&N 33-2830, and BMC 311/01. now just to do a little research into opening the bottom of the airbox up a little... VW has quoted me $360 for the entire airbox assembly... any ideas guys? remembering that i want to keep a spare for stock purposes.