Does that straight-through muffler have a harsher tone and louder note since when you first bought it? Chances are that it just needs to be repacked with fresh fiberglass.
Don’t worry, you don’t need to contact a specialty shop: We covered how to repack a muffler at home–even if it’s a sealed-for-life unit–back in the November 2014 issue of Grassroots Motorsports, …
