I'm slightly familiar with the M400, but I'd be interested in the differences, and whether or not you've done the oil pan. :wink:
For something like this, my Boxsera is up for trade. I have the 3.4L Carrera motor with just a few thousand miles on it, X51 oil pan, headers, cats, Borla exhaust (best sounding car at the track, ever), PSS9, chipped to 322 HP, Spec clutch (and a spare upgraded one in the closet), intake scoops, F1 canister air filter, three sets of wheels (R1R, snow tires, and biiiiiiig Hoosiers).
This will catch a GT3 and really annoy them with the right driver. They'll ultimately pull you on the straights, but in the corners, they'll hate you.
For example, last year, the Aston Martin Owners' Club came to Summit Point. They had one of the Porsche factory drivers from Holland there as their guest instructor. He was driving a Maclaren SLR in the instructor session. Coming through T10 onto the straight, I felt the ground shaking. My buddy who was in the passenger seat was watching the mirror with his jaw dropped. The Mac was shaking the ground as he passed us down the straight. Heavy braking into T1, rocketing through T2, on the limit through T3, and then The Chute at 90+, coming into T5 we were under the massive rear spoiler/airbrake. I was on his butt through to T9 where his long legs and massive power catapulted him ahead, around T10 and down the straight again. T5, once again I was under his rear wing. My buddy was giggling like a 12 year old school girl. One more time around, on his butt at T5, then at T6 he gave the pass. Now I was giggling like a school girl.
We came into the pits and he was looking at my car. He asked how I changed the tires so quickly. I was on the R1Rs. I really wish I had been on the Hohos.
So yes, a fun and fast car, and hadn't really considered getting rid of it except maybe for a newer GT3 (997.1 or .2 as I'm faster than the 996 ones when stock). The Noble is interesting enough to me to consider.
If you haven't sold it, bring it to the next event. We'll swap for part of a session, or maybe ride together.