need help on exhaust system!

[thor1721]

hey guys whats up? i need help on a exhaust system. i have a 400ex basicly stock except for a jet kit and a 14th tooth front sprocket. i have a wb slip on now and it cracked in the rear part on the canister. i was thinking about a couple different kinds of exhaust, the yoshi, lrd, procircuit, bills. can you guys give me some info on theses pipes. i heard the yoshi touches the oil res box. thanks

[honda270ex]

i would go with the lrd or te procircut

[thor1721]

thanks honda 270ex i am sorta leaning towards the lrd. but what pipe will give me a good low to mid range?