im going to use a pipe expander to round out the muffler but i have to wait till sunday to do it since im going to clean up the welds inside the tubes. the finish is not as top notch as i thought it would be on this full system, especially with all the hype and talk this exhaust gets. the full ti arrow system i had on my triumph was much better fit and finish along with the acropovic ti exh i had on my r1. both excellent fit systems and great quality.