The w9 exhaust port is DEFINATELY higher then a w2/w5. You'd have to be careful about clearance to the rest of the suspension if you were going to do that.

It's the same reason a -1 Indy Big Block header is different from a conventional head, and drove Indy to create EZ line of heads.

I've yet to see a set of w2/w5 headers, actually put into a car with w8/w9 heads. You'd think if it was that easy, TTI would just weld on different flanges, and market them to us...

Not saying it can't be done, I'm just saying be careful before you blow a bunch of money on a set of headers that won't actually fit in the car...