Why are you blasting around doing 150mph when you've not had the map sorted?
Are you trying to make the new engine look like the old one?
i blasted about like that for over a year and the car has been on the mtm map for 8 years before the engine got wrecked (and they way the car gets drove at times is really hard)so it can't be that bad of a map can it ?? I have heard that mtm do run the cars on the lean side.
I will be getting a custom map as soon as I can anyways to see if there is any gains to be had