I was looking on HPI's website at these two engines but dont know what the difference is between them. one is $96 and the other is $105. What gives? Hahahaha
http://www.hpiracing.com/products/en/15105/
http://www.hpiracing.com/products/en/15107/

I have a RS4 3 18ss and NEED a new motor. People are saying OS is where it's at but when my Nitro Start T-15 was running, I thought it was bad as$. What do you think? Is it worth spending the couple extra bucks and getting the .18 or for $67 on Ebay, sticking with the stock .15? Thanks, Joe