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« on: April 02, 2017, 05:06:17 PM »
Welcome to the Pilot owners club! Most of the upper frame improvements consist of replacing the whole thing with a chrome moly set up. Whether they are still being sold, I don't know. I feel safe in the stock cage, but anything can be destroyed in a bad enough accident, so your desire to improve the stock cage is good. No idea where to add more to the stock cage.
I've run a 600 Rotax with a stock Pilot gearbox with hard use and no problems, but a 583 might be safer bet than the 670. That should be enough go power.
I have an Aftershock front suspension kit on my 600 that I'm happy with. Still using the stock front brakes with no problems, other than the need to adjust them.
Aftermarket seats need to be a narrow model to fit in easily. Make sure to add a skid plate if you switch to protect your ass.
The Team Tech Jet Pilot harness has a bunch more "hold you in the seat" ability, but is a pain to get in and out of. I had one, but switched it out for a set with wider belts that was like the stock set.