Finally got to try my Razor 4XL yesterday, Started with two large vents and two solids in the rear holes. Hole shot was pretty good with no blowout so I swapped a small for one of the solids. The holeshot was better and still no blowout. Didn't have time to do any more experimenting. Top end was where I was surprised, wot rpms were 5800-5900 with speeds close to 73 mph. The last time I ran my Razor 3 the weather was pretty close to the same and it would only turn 5750 @ 70 mph. Handling was great, feels like a completely different boat!! Worth the wait!!!