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1) GSC has been out longer than Cosworth and is on their second version, which is making more power than Cosworth. People have also been reporting problems with the Cosworth exhaust cams not always fitting properly.
2) What made you think 272s would not pass emissions? there's no reason for you not to pass emissions just because you have 272s or even 280s instead of 264s. There are no 264s for the IX anyway, then you just need to get a proper custom tune from a tuner that knows how to remove the idle lope caused by high duration cams - no problem.
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11.51@117.72 - PMI
11.62@116.60 - Bandi
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