exhaust pipe rubbing shock???

[nambo-trev]

hi guys, im trying to figure out what part i need to fix on my nambotin, the pipe(where it meets the silencer)is pushed up against the nitrogen canister on the shock. ive swapped pipes to see if another pipe would fix it and i get the same result and i took the silencer off and it doesnt look bent? could it be a tweaked sub-frame? the sub frame looks good and cant see anywhere it would be bent? can you guys give me some advice???