K, with the Mac, try and use the Mccoy MC-9 plugs, I found these work a treat on these engines. Forget about the boost bottle, you gonna get not much return for a lot of work. If you need more power, get a decent race engine, you won't regret it.

Stick with the 14T clutch bell, I never ever felt the need to gear it up.I was clearing the doubles at Clanfield with a short run up with half throttle and sometimes less.

With regards the diffs, I have gone to much thicker oils and it has made a heck of a difference to the handling. I now run 10K front, 30k centre and 2k rear. With regards to the shocks, the oil you use depends totally on the surface of the track you running at. I now run Hong Nor Super Big Bores, but from memory, I used to run anywhere from 30 up to 55 depending, with slightly heavier on the front than the rear.

As for the servos, get rid of those MG-995's. All you need is a failure at speed on the steering or on the throttle and end up with a runaway, they are notoroius for failures. Save up a bit more and get some decent servos, like the Align's or the Savox.