what is the best plug for my mammoth?, the engine is still new as i stated in another post only 4 tanks through it.

Thanks

IF your using 30% nitro or higher stay with XTM #4 or SH #4, also MC #9. IF your using only 20% nitro then i recomend MC #59, or OS #8. The number 4's, & #9 will make it run colder wich is best for high percent nitro & the #59 also the #8 will make your engine run hotter ( lean ). Hope this helps