You should have little to no problems - A1's and A2's are Golf and Jetta body codes - which gives you basically a wide array of engine options - including 16 valve, G60, VR6 and 1.8T engine types - these cars were designed to be fabricated - if you had a Fox on the other hand - which has a longitudinal engine - than you could run into probs - but this is a very possible engine transplant project - I say go for it if you can