Carl ,
i understand your point although i do not fully agree (see apr stage III and IV) but each company is entitled to its own opinion.
but if you don't offer a tune for the GT2871 than why do you suggest it to the client (GILIM) . it is obvious that this will not be an optimized tune and will not extract the potential power of the 2871 and might event cause EGT and AFR problems.
i think its better to respond like you did now and say - "We don't offer a tune" than to offer some hybrid that's obviously prone to fail.
Have you been in an APR stage III car?? Seriously, there not as impressive as they look on the 'videos'
If Revo say that they would supply a map and control the boost with a manual controller and feel that is a valid option (which I see absolutely no reason why not) then they must be 100% sure it is.. Why bother if not? Remember, Revo have the option of supplying the Stage 4 file to who they want..
GillM.. Go with Revo, or take a punt with someone else, as thats all it will be.. You will end up back with Revo wishing thats what you did first time round.. Your more than welcome to have a passenger ride out with me in mine and ill demonstrate just how smooth and efficiently the Revo Stage 4 map is!