hi guys seen some de cat pipes on e bay ive got a stainless exhaust on my 94 sti rite upto the cat.just wondered if most de cat pipes would bolt upto this ok? i dont wana be buying the wrong type other words are most de cat pipes all the same diamiter not sure wat make my exhaust is but the pipes look about 3 inch.any help would be good thanx

 

is it a 3 piece exhaust? ie: back box, centre, and up pipe?

 

im not sure shaggy i think im gona have to look at it its sum japanise unknown exhaust.i reckon it is 3 inch looks about rite the tail peice is about 5.