Wiseco pistons and K1 rods
I don't remember but it was measured in Pounds, not grams.
The advantage of forged components in the reciprocating assembly in a turbocharged slant six application is not so much the weight advantage I think, but resistance to the deleterious effects of detonation. Cast pistons will be damaged by detonation under boost, where forged ones will live a little while... At least, that is what I have heard.
It gives you a second chance, where there is no second chance with stock internals should you accidentally encounter detonation, under boost, due to, maybe, a lean mixture, or too much spark advance, excessive heat, etc.....
Just my opinion.
The weight saving is definitely important, too, but not AS important, I think.
At any rate, the forged parts are definitely worth the money, IF you can afford them, IMHO. Not necessary in a N/A application, except in the case of a high-winding 170 where the 7,000+ rpm revs could cause a stock piston to be pulled apart at the top of a stroke, due to inertia.:oops:
