| You've got guys that will barely run the car and you've got guys that were killing the car the entire 30k miles (or whatever x mileage is) If the components are in working order (GOOD tune, oil changes, quality fuel, etc) there should be no reason a built motor wouldn't last that long. FWIW my current Z does not have a VG - but the RB has seen almost 18,000 miles of straight-up abuse. It is currently a stock shortblock with headgaskets/ARP studs and some small tomei cams. On the dyno 3 years ago it made 718rwhp and a few years before that it was making 680rwhp. If I were you I'd just stay stock and make sure its got a good solid tune before you do any beating on it and put your money into efficiency mods. So many guys get all giddy to go out and rip on the car they completely lose all rationality. (I have seen people so excited to drive their car before they forget to torque the wheels after lowering it off the jackstands after spending all winter working on it!) Keep a wideband in the car, datalog if you can, know where your fuel pressure is at, etc - basically have a good baseline of all the fundamentals of sustaining good power :)
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