We have worked with a couple of the MXP downpipes (for GTR and Evo X) and the quality has been nice. Fitment was good on the units we've installed here. I'm glad they're starting to come out with more exhaust systems.
I dug up the dyno information from their exhaust on the G37 as well as a picture of their new G sedan exhaust, just to provide some additional information about MXP:
