7M-GTE head bolt fix,the most important mod on an A70

The 7M-GTE head gasket failure is legendary and it's caused by factory head bolts that stretch under boost. ARP head studs fix this permanently. Every A70 Turbo needs this done, full stop. Budget $250 for the studs and about $1,200 in labour if you're not doing it yourself. While the head's off, get it pressure tested and skim it. If you buy an A70 Turbo and the seller says 'it's never blown a head gasket', either the studs have been done or it's about to blow one.