I have a 1990 civic hatchback. I bought a universal flat black vibrant exhaust on here for 121 shipped. But I brought it to a shop to get it installed and they can not do it. Unless i trim the inside lip of the bumper.

Has anybody out there bought the same muffler as i have and made it fit our cars?

 

take it to a different shop. some shops are lazy and want to charge you extra. Real shops will shorten your current exhaust system to allow that muffler to fit