They were on a heavily modified '88,i'm not putting my hand into the fire for those but from what i told they are F3 pipes,anyway since you're sure i'll buy it

Anyway Glen i must say that that they're very very lightweight and they give you a healthy 12500 over rev,they sound like heaven too
You cant go back after you install those in your bike..believe me
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Addicted to that Rush..

NSR 250 MC18 '88 JHA pipes
NSR 250 MC28 R Tyga pipes
Aprilia RS250 MKII Arrow pipes