I am currently running a GM-4 turbo... I have a GM-8 which I will be sending to the local shop for a RE&RE at a cost of $700. This will be installed in June.

I will be installing an intercooler in June, similar to the $400 unit profiled in TDP. It is a 1 foot by 2 foot core with a diameter of 2.5 inches.

I tow a 4000 lb boat... with a 2000 lb camper in the summer.

CR is 20.2:1

Thanks for your input, it is appreciated.
Mike