i need(want) a better engine for my hpi nitro mt2. when i got this truck it had a .15 hpi in it, which starts and runs well(out of the truck). Does anyone have experience with this engine/truck combo.
1)Will i want to go bigger (.18) or is the .15 good enough for that truck.
2)Since i don't really know all of what it has been through...should i use HPIs engine replacement plan and get a new one for $65. Or, find something on ebay.

i will be mostly backyard and park bashing with this one, might make it to the track a couple of times.
thanks for any input.