5:30 ???
you are joking, right?
Just got a modified M7T from Mantisworx and Its a screamer with wild mid. and it runs 9.15 to 9.35 on a Team C GT8 with a 9 restrictor.
You've got me confused. The M7T is an on road engine, so I didn't assume you'd run it in a GT car.
I'm not familiar with GT, but in 8th scale onroad any engine that makes 5 minutes is great.