is this exhuast stock?

i recently bought my first kawasaki bike, its a 82 kz550 ltd and i im not sure if the exhuast on it is stock. it has a 4 into 1 exhaust system. every picture iv seen of those bikes has 4 into 2. reason for asking is because i need to know if the bike was rejetted when or if the exhaust was put on, because i bought pod filters for it, and with those, im pretty sure i will have to rejet it. theres no markings or signs of it being aftermarket exhaust, so it has me stumped. thanks.

If it is a 4/1 it is not stock.Even it was,
pod filters usualy require rejetting.

ok thanks. since it has an aftermarket exhaust, i would assume the carbs were already rejetted. i didnt want to rejet them for the pod filters, already thinking it was stock; if that makes sense. is there a rule of thumb for what jets to put in when installing an exhuast on a kz550? i want to get an idea of whats in there now so i have something to work off of. it must of been a few owners back for whoever did the exhaust, and i have no way of reaching them.