the one that goes across as it is now..............
If you fit the 80mm maf it will need mapping in, but im sure you have to run the vxr injectors also.... but thats stage 3.5 territory.... which ull also need a exhaust and front mount to......
However, im not sure if they sell the crossover delete pipe to suit the 70mm maf, they may well do, but ive never looked into it.....