Today I change throttle body for 74mm.
I think that 68 and 74mm throttle bodys are very simillar, probably electronic is the same, only differences are bigger whole and bigger metal circle (sorry for my english).
After mod I feel nothing for +.
RPM limiter on neutral gear now is about 4 500. Before was 4 000-4 200 but I not remember exactly. How many RPMs you have?
This modification is very simple.