i'll tell ya why...

A12s are throwaway. blow one up and no-ones gonna cry. that also makes them cheap to modify. i have 1 in my shed i plan to turbo at a later datre

add to that there are no licensing issues turboing an A12 in a 1000 or the like.

class regs for under 2L stipulate that a turbo A14 is out of the question (1.7x NA capacity), but a turbo A12 comes in at 1990ish cc.

so there are plenty of good reasons to do up an A12. it's like picking an RB26 over an RB30 - one revs harder.

i know which one i'd pick.