um shit i dont really have a clue about them as i bought them as is for my ta22 and was gonna make a custom manifold for them.im assuming they are of an 18rg but im not sure.i also wasnt able to get any specs on the as all i could find was a sticker with the numbers 21100-882554.So i really dont know.I was hoping for melbourne interest that way they could come round and c.anyway il c if i can find anything out later on the net 4 youse