how big is a d16z6 throttle body... and can i swap it for say a gsr throttle body? trying to create more airflow

 

56mm. You can swap it for a GSR T.B., but you have to port match your intake manifold to really make it worthwhile, and even at that you probably won't notice significant gains. You really need more air (forced induction) to justify a much larger throttle body.

 

so if i was going to put a y8 IM and a bigger throttle body on my d16z6, what would i need to to do it? is porting expensive?

 

during school BUMP.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EGhatch33 &raquo;</TD></TR><TR><TD CLASS="quote">so if i was going to put a y8 IM and a bigger throttle body on my d16z6, what would i need to to do it? </TD></TR></TABLE>

You would need to have the manifold ported to match the diameter of the throttle body, just like I said.

Y8 intake manifold and Z6 manifold have the same inlet plenum diameter I believe, 56mm. I'm not sure how much porting is, you would have to take it to a machine shop and ask them.