We have a 99 Gulfstream SunVoyager DP. I'll have DH post about the engine/tranny kind of stuff when he has a chance. He also has contact info for Spartan (PM us if you'd like some names & numbers we've found and used). I do know that we replaced tires (due to age) and upgraded our converter (Wizard so we can leave the coach plugged in while we are at our house). We've added vent covers on the three power vents, new shocks on the front, pressure pro tire monitors, SMI brake system (we toad a 06 Jeep Unlimited with no problems, but wouldn't want to go without the brake system), new weatherstripping on entry door, changed out the VCR for a DVD and lots of redeco inside. For a 99 coach I don't feel like we've had to do an extreme amount of work. Mostly safety (old tires) and comfort (new curtains, etc).
Reality is that which, when you stop believing in it, doesn't go away.
--- Philip K. Dick
1999 Gulfstream Sunvoyager (Our Gulfstream Home Site)
2006 Jeep Wranger
German Shedder Dog
Rescued Gentleman (In Spirit)
No complaints about the Cummins/Allison combo - its probably at the low end of HP & torque on our 32' with toad. We've only put 3-4,000 on ours, and its my first MH and first DP. So that's all I know (kind of).
A Banks kit sounds fun, but marginal return on a MH that won't accept a lot of investment and show any return, other than blowing other DP's off...........LOL