you could get pistons for less than that tbh. from wossner id expect to pay around £550 then head gasket then head bolts. so around £650.
they are a very good product and many people have used them in highly tuned cars.
the difference they make is dependant on the spec you are going for. just the pistons wont make a big difference really. they arent to hard to fit if you have a good knowledge on engines, its described in the haynes manual. but if your not mechanically minded i would try it.
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Boost pressure is underrated
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