i'm running a 2.5 inch extractors that are port matched and run into the original exhaust which is past due for replacement... i gained about what i lost going from 31's to 33's. it also opened up some more revs.
fuel economy... umm still about 11-12 per 100 didn't really change but i get there quicker.
i didn't change the pump but it might be possible to get a bit more but i don't think it would be worth the effort.
extractors the best 50 bucks i spent. ( it is a temporary measure until i get the T word) got em 2nd hand from a neighbour took a day to fit em, broken manifold stud gaskets weld to original exhaust etc.
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