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biggest problem with putting W2 headers on W8/9 is plug clearance especially on 5/7. The plug location & angle on an 8/9 is so far from any normal 18 degree head that plug wire access is tough. I had Heddman W2 headers on my old W8 motor with modified flanges & had to install plug wires on 5/7 from under the car with a pair of needle nose pliers.

& then the biggest problem with trying to do a set of TTI's is they are very restrictive for a 680+ HP motor, so what's point of building a killer W9 motor & bottle neck it with a restrictive TTI header?

If you're gonna try to use an off shelf header & mod it, I'd do a 2" tube Heddman W2 & start with that.

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