Update:

Took it in for new Link G4, injectors, rails, lines and E85 tune.
330whp. Disappointed is an understatement.
Couple of grands worth for 18HP and the hassle of needing E85.

I'm stuck over seas at the moment and cant call, but over a few emails we're kind of looking at the rear housing being a restriction.
The single scroll version of the Dom 3.0 had a choice of the 8/10cm rear but the twinscroll one i've got had no option, and has no specs i can find on their website.

Does anyone have any experience with the twin scroll rears?
Admittedly, he says it comes on real early, which was why i went for the TS option in the first place. But i see over 100HP difference as a lousy tradeoff.

I'm home in a week to go have a good chat/suss but im keen to hear any thoughts.

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Balls.