what are the dis/advantages of the z6/y8 compared to the d15b?

 

d15b= 9.6:1 compress. so you get more power per lb of boost. but cant up the boost more than maybe 11lbs. and u can go 12 lbs maybe on a z6.
Lets just day i boostid my d15b and its at 8.7lbs and is pretty crazy.
Do it! Do it!

 

how high can you push a z6 with forged internals? dunno never baught turbo pistons before. what c/r are they usually?

 

They are usually 9:1 forged. go with wiseco or something.
you can probably put 330whp on forged internals and some headwork.