I understand that the complete BOE solution with the rear caliper upgrade is awesome.
But if I understood you correctly, you think only upgrading from stock to rear calipers with proper bias, without complete BOE setup is worse than doing nothing?
May I as why you disagree with Phil on the staged approach?
As far as I understand there is hardly any difference in work or parts between doing it in stages or all at once.
I think that under a lot of circumstances (noting that, apart from brakes, you have to factor track/road, driver style, wheels, tires, ride height, suspension compliance, car weight and distribution, with driver), having the same braking on all 4 corners yields a car with too much rear bias (speaking for the S2). Upgrading the rear calipers in an 08+ car is a no-brainer, but for us with 07- cars, the situation is less clear. Edit: 08+ Exige is 4-pot in front, I don't know about the Elise line.
I am only guessing that this is the basis of the
recommendation, but I would make the same recommendation (Phil can jump in).
I admit, I am talking only about track driving, and I know I am prone to jump on the brakes.
I also guess that I have boiled the OEM rear brakes on track more than once in the stock configuration (I guess because when I was rebuilding the calipers, I found carbonation inside the cylinder). I say this just to note that a bias cage used to work those poor Brembos harder is likely a bad idea.