There is nothing quiet about the XR1's. Borla Part#40941 is the muffler I have. 12" long 2.5 center in center out. I have tailpipes that dump behind the rear tire.
Here is an old vid I made awhile back. There is a short exhaust clip at 1:10. The video doesn't do it justice though
1997 Blown Mustang Cobra - YouTube
Here is an old vid I made awhile back. There is a short exhaust clip at 1:10. The video doesn't do it justice though
1997 Blown Mustang Cobra - YouTube