If going from a z6 to a y8 do I need to change the ecm? What is the benafit of a y8 intake on a z6? And where is a good place (other than a salvage yard) to get a z6 or a y8? the place I have has 90day warranty $185 shipping, z6= $420/ y8= $840.

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if i was you i would go back with the z6 just b/c it cheaper and your not goin to get much more power out of the y8 maybe 5 or 10 hp

 

What makes the z6 better than the y8? The y8 would have higher compression, and less miles.

 

Just because it is a few years younger doesn't mean it will always have less miles. I really think you could spend that money on something else more worthwhile. Maybe it would be better if you had a non-vtec head but you already have one so your not gonna see much of a gain.

 

The z6 I have is Vtec. Why would I want non-Vtec.

 

I said it is a waste of money to take off your vtec head and put on another one. The only reason you should put a y8 head on your engine is if you don't have a vtec head, but you do so the z6 to y8 swap is a waste of money, it could be spent elsewhere with better results.

 

Ok, I was told that putting a y8 intake on my z6 would improve its proform. some how. If thats true how?

 

That is controversial, some say z6 intake manifold is better and some say y8 is better and I haven't seen any dyno charts that say either way. Anyway, if it is actually better that would mean that it flows air better.

It is performance not proformance....