hmm thats strange, well the cars been used unmapped like it for years so i guess it'll make no difference. But if you want it done that fast aren't you going to struggle to book it in and be done within a week?! I think your only option is to go to steve asap. end of. And whilst i fully understand about family, work commitments making it difficult etc, a few hundred quid on top of everything you laid out for the engine surely coulda been manageable lol, anyways saying if its not done before nunny it never will is silly - it surprises me your engine hasn't died already after 4 years so rich/lean etc, any more and imo it'll certainly kill it. Get it done, if the engines still reasonably healthy it'll transform the car!