I've said it before, but how old was your Mugen?
I always wonder what would have happend if you bought a brand new Mugen instead, and compared it with the "old" worn out Mugen.......
I have had several Mugen cars, (all "brand new") and this is just my opinion, but I believe the NT1, to be the better car out there, right now. That is the advantage to being the newest car out there.