when did you purchase it? lyle at chp told me that he made a limited run or the 70 exhaust i wanna say 50 or less if memory serves me right. he said that he wasnt getting enough demand for them so he pulled the plug on making them. so if you bought it pretty recent its not a 70 its was prolly a 50. this pipe i picked up off him in 08 and thats when he told me all this he was nice enough to pull it off one of their old race bikes. if you search through my post youll see pics of it on my reeg.