Thanks, ideally I'd like to avoid paying up for any expensive backing plate and just stick on a 2.5" flange onto my existing oe plate. However, the plate on my car isn't flat throughout and any flat area is too far out, not close enough to the hub. I know it's easy to bend the material but have to first see nothing will get in the way. Else I may have no choice but to buy an expensive Turner/BW plate and use the coupler.
The hi-temp hoses are good up to 600*, the standard is 300*. The high temp couplers I've found (used for intakes, turbos, etc) are good for 500* so I think I'm ok on that front.
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