OK, here's a funny question. Using a 106 in an MSA championship means keeping to a 1400cc capacity limit. There are 3 ways of doing that.
1] 1.4 n/a petrol (can be tuned to any limit, it's only capacity that counts)
2] 1.0 turbo petrol
3] 2.0 turbo diesel.
I'm not looking for the 'easy'...