aftermarket parts for extra power

hi i currently ride a husky te 310r 14 and find when I'm doing slow technical sections of tracks and rock hopping or logs etc. my bike doesn't have the low down grunt or torque in the low revs that i would like for this type of riding unlike open grass tracks where i can hold the bike in the high revs the whole time where all the power is. I'm wondering what aftermarket parts or mods i can do that people recommend (brands of exhausts etc) to just get a little extra low down grunt out of the bike. any opinions/suggestions are welcome thanks