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Engineers from German tuning house, Abt, have trained their pocket protectors on the Audi A4 Avant, with performance packages that add juice to Audi's 1.9 TDI, 2.0 TDI and 3.0 TDI versions. Abt's 3.0 TDI quattro upgrade offers a 48hp boost, to 252hp, mainly by way of engine management hacks (though in their case, it's more like "modifications.")

New Abt AS4 Avant [German Car Fans]

Related:
The Truth About the Audi S4 Avant