Exhust chatter in reverse??

[topp_shotta]

Ay one tell me why??? was only at a certain rev and dont always do it??? is it a heat sheild??? some one sed it might be gearbox cuz i get abit of a donk when i first put it in gear?? and i thought my old fiat had alot of nocks and bangs thanks

 

[The_Pirate]

Is it a standard fit exhaust? May be loose at one of the exhaust mounts