aren't the s2ks pretty maxed out on n/a power from the factory? they do well on the boosty both cars are expensive to mod: newer cars, more high end, more expensive (you just have to know ppl or get great deals and you wont have that problem). the s2 is a drop top and thats a plus, Z is a slug as a vert. stock for stock the suspension on the s2k is wayyy better then the Z.

what yr Z you looking at? different versions respond different to mods.