There are many possibilities when it comes to the engine internals. Parts from Audi S2 and RS2 can be used with a minimum of grinding to fit the oil-squirts.
For high output engines aftermarket rods is a must. And custom pistons are affordable bought on the right place. There is a supplier om eBay.com that’s wery reasonable. You just have to fill in the custom form.
Well according to VWvortex, the ABA engine is happy to receive
some nice boostlevels of T3-turbo’s. 300bhp is quite standard…
Lowered compression via extra headgaskets or spacerplates are needed. But give no problems at all.