Hi guys. I'm building a snow bike out of a raptor and trying to decide between 5050 and web 4. Snowbikes are run wide open at 10000 feet all day long. It's like climbing a never ending sand Hill. The drone on 450 mx bikes is obnoxious and many wear ear plugs. My build will be 14:1 corrected comp or higher, Pump gas, no air box or filter (just a screen pod to keep pine cones out) and the lightest pipe I can find under 96db. It's already a heavy pig and duals will make it unbearably heavy in my mind... All logic says the less overlap on the 5050 will work better with a less than perfect exhaust flow but on all the snowbikes I've built the peak top end number always wins and they have to stay in the top end all day. Low end torque is useless unless you're going down hill you need to stay on the hp bubble. Also I'm afraid to go with any bigger cam because of excess wear on the valve train. It needs to be reliable. The good news is at 10k my 70hp engine is only going to have 50hp so the bottom end should stay together just fine.