Dinan High Flow X-Pipe (F8x M3/M4)The Dinan High Flow X pipe for the F8x M3 M4 elicits an aggressive sound that is sure to capture the ear of all bystanders and delivers the aural recognition that all M3 M4 owners deserve. Coupled with the associated Dinan exhaust the sound is further perfected into an aggressive growl that harkens back to the Dinan E9x M3 racing middle exhaust. Note: Since a resonator is deleted there is potential for increased cabin noise associated with the Dinan