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Depends on the driver, plenty of 12.7-12.8 quarter mile FG's, haven't seen the same times from a stock VE SS.Speaking blankly here,
180's and silvia's with 200kw at the motor (stock) at 1350kg beating your 270kw 1800kg SSV, probably a case of power to weight ratio there.
Getting smoked by FG XR6T? I have mates with VE SS/FG XR6T/FG XR8 utes, all manuals, all stock apart from cutting a muffler out. Numerous drags over the past year and a bit have all resulted in hardly ANYTHING between them. Power delivery is about the only thing that separates them...