There is an outside heat shield that makes it look huge. Inside is close to stock and stepped to a different diameter part way along the pipe to help keep the gases flowing at an ideal rate as they cool.http://www.enfieldmotorcycles.com/forum/index.php/topic,15069.msg161863.html#msg161863"The pipe is a stepped head pipe, 1 5/8 out of the head to 1 3/4. They have a 2 1/4 full length heat shield back to the muffler, that is what gives the head pipe that big look."And this is designed to go with a free flow air filter (available from them) and the stock ECU.Scott
foggyAny reason for selling your c5
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