I have been offered a magnex 1.3SR backbox, however my car is a 1.2 Merit, I know you can graft loadsa engine parts from the SR engine on to my novas engine, but I aint sure about the back box cos in one of my catalogues I was thinking about a janspeed backbox, but its only made for an SR, and needs a new centre section to make the pipes mate up, however I have been offered an SR centre section too. Please! I need help on this one