Bolt on flanges installed improperly- brought it back to get placement of flanges back to stock so I can install muffler I bought- was charged $160 to have muffler installed- I did not want muffler installed as I can install that in 10 minutes- then instead of rotating engine pipe flanges - they cut off my new muffler flanges on my muffler to meet the incorrect flanges. I am still unable to change my exhaust- I need flanges brought back to stock User's recommendation: Stay away.