[AK]

Griff, the smallbore pipe is ideal for the 600ss (with 583 engine)
With the 600ss, the ground clearance as std is better than the monster one std.

Generally, I found last year that the 583's ran better with a 2 into 1, but the mid range was better on some of the twin systems fitted to monsters.

Use what you have on your SS, just replace the end can with a performance can, and fit a dynojet kit.

Good luck

Alan