You would be much better off going L8 ecu route Chop.

As for 55lbs are bigger than greys but there a more modern design so can be controlled better. If you have not bought any yet i would go for 83lb's, I know this sounds alot but if Stu is Live mapping the car it doesnt matter. Also when you want more power 6 months down the line like you will you wont have to buy another set of injectors.