what the max hp some dyno with bolt ons?
 

im trying to to mod my z

You're going to get different numbers based on the Dyno used along with a host of other variables. What you need to look at is the max gain from stock specific to the car and dyno used. I'd say about +/-50hp gain at the wheels is a safe bet with bolt-on's & a tune.

Go Here

For a big power bump, you have to go with forced induction.