Hi, I just purchased a 450L for the wife, wanted an automatic Bike for her because we go to the dunes a lot. Thought the 450L would be powerful enough and I didnt consider the weight of the bike. so went on the dunes last week, reduced the pressure on the tires to get better grip, was super disappointed at how weak the bike was especially going up hill(not a big hill). I was wondering if there was any Upgrade parts that are available to increase the overall power of this model?

Sorry to hear that.  I have not ever needed more power to go on any incline.  My Cforce 450L has plenty of power to keep going even on mud but I have never try driving in it in deep sand reason why I never needed much speed at all.    You might be able to get the machine to run better for your needs with a clutch kit from either "Main Street Cicles" https://www.mainstreetcycle.com  or "Red Neck Garage" https://rngperformance.net.  Give them a call and explain your problem cause they have a couple of kits that would give you different results.