i've got a z6 thats pretty much stock, i,e,chip. well i recently decided to build this engine n/a. i'm gonna turbo another block. that i'm planning on spending some money on. but the ? i've decided to get either a1 or a6 pistons. any advice would help me alot. just the basics pros cons ect..

 

ur doing an all-motor D series? Those can get ugly. If you have a z6 i would boost that one and go turbo on a different block. z6's are badass for boost.

 

D series dont flow that well, go B if you want NA.