I bought a 2003 DRZ400E with a DRZ400S can attached to the E head pipe. I believe the previous owner must have taken it to an exhaust shop to have the end expanded so it would fit over the 400E head pipe. I want to shrink the S can back to stock (since the mid-mount bolt wont align) and sell the S can. Can someone tell me what the ID (without gasket) should be for the S can? Thank you!!