I talked with there tech support
"Amy: Sorry we don't sell engine parts.
dom: so you would have to replace the whole thing?
dom: ok thanks. last question 2 questions.. when will the ultra upgrades be back in stock?
Amy: In about 4-5 weeks.
dom: what type of nitro should i use when if buy on
dom: *if i buy one*
Amy: nitro gas.
dom: 5%, 10%, 15%, 20% etc... which blend works with the car?
which was a lot better then most places....