Sounds good, if you have ported ones already, then I wouldn't bother.

Personally I went with composites for 3 reasons.

GS 8mm phenolics with a gasket cost $100... composites are $200 and have o-rings. halfway there already.

I didn't have jdm tgvs, so there would have been a cost/labor involved, composites are a done deal.

the composites save 3.88 lbs over stock tgvs (and I believe over a lb over jdms)

as far as I know, if you are going for max flow, the 2.5 intake outflows the plastic all day long, but there's more work involved in the swap.

here's a good thread, with a few of the flows.

http://forums.nasioc.com/forums/show....php?t=2229576

The composite manifold is definitely lighter and less susceptible to heat soak.