Hi, I run one in my X6 (same gearbox ratio) with an 8.5 motor and a little bit of timing. As above it's as fast as anything else but very smooth. As long as the straight at southport is, it doesn't contribute massivley to your overall lap time, certainly but being really punchy on the in field could cost you more time that gained on the straight. Bury straight isn't that long due to the apex and the hump (actually is the old track still there?). Also due to grip I run my slipper really loose at both tracks to smooth it out and keep the front down.
If you're concerned about being too slow get the 7.5 but I would not suggest the 6.5.
Note this is assuming you have decent cells and running a novak motor. I know other motors vary speed due to internal timing and other things.
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