Thanks for the welcome, guys.

I was a bit surprised at the 4 x 108 hubs. Honestly it is a bit of a pain, because it means that upgrading my rims requires quite a bit of money. Stock, they're:

18 x 8.5" front, 5.5" backspacing
18 x 10" rear, 6.75" backspacing

2.5" center hole.

Another problem is the calipers, which are pretty big. They tend to be close to the spokes, especially on the front rims.

A 5 bolt system would give us a lot more options in terms of wheels. The vast majority of light wheels do seem to be 5 lug, especially the ones I seem to like. I'm considering waiting for those carbon fiber / titanium ones to come down in price a bit.

On turbocharged applications Jet-Hot should increase the HP a little bit, but I would say probably not more than a few HP. It'll also increase spool up speed a tad. The main benefit is really the heat management though.

If you take a look at that blue car above, that was the GTO-3. You can tell by the headlights. The steel gray car is a GTO-3R.

The M400 looks like a GTO-3R on the exterior, except it has enlarged side vents, slightly different coloring on exterior trim pieces, and anthracite wheels. I got mine in the silver though, since black on black is a bit too much for me.

BTW, if you guys have time, come visit us at http://www.nobleforums.com. That's the US owner's forum for Nobles. It would be great to exchange ideas. Though not everything will work cross platform, I'm sure there's stuff that we can both benefit from.