Originally Posted by Chris-s

I have always used the NO6 plugs with mine, nice wide tuning window.

As far as runtime, over 10mins is easily achievable, have seen as high as 12-13, but this is driving with a more careful throttle finger. Bearing mind this is UK/European Tracks.

I have not run a xzb spec 2, but have run a bullitt 216 and vzb speed. Compared to the 216, the BXR had a much stronger but more linear bottom end, found the 216 to have very little bottom, then all of a sudden, bham, power.

Originally Posted by Wild Thing

We run the BXR's and a good friend of ours runs the OS Speeds. There would be very little difference in the top end maybe a slight advantage to the RB and the OS would have a slight edge down low.

The OS P3 will run in just about anything and would certianly work on the BXR. But as already mentioned we have had the best results with RB 6 plug and on really hot days over 30 degrees we use the RB 7 plug but the tuning window narrows up on the No7 plug

BTW we can't get any where near a 10min run time in a buggy... about 8 to 8.30 is it for us

Cheers

Mark