after several months of getting horrible mileageon my v10, like 6mpg on highway, I took the muffler off and checked the inside of the cat with a flashlight. one was different color then the other, so I got out a 1 1/4 inch wood drill, the biggest I had, a 1foot extension and my trusted dewalt cordless and made two holes in my cat. during test drive it felt like it needs a lot less pedal pressure to stay at 60mph, wont knoiw till I go through a tank, nut I was getting steady 6mpg fopr ythe last 3 fillups

 

maybeit's clogged. my element blew straight out the biatch when it got clogged. maybe you could gut it and install a flamethrower kit

 

I started saving money when I gutted mine! It was clogged as hell.

 

this thing is gonna ge gutted for sure, I just dont have time... if only I could find a 2 inch drill bit, I'd let her have it

 

Garden shop! Ground auger...they use them for deep root fertilizing of tree roots.

 

Just get a piece of galvi pipe, like 2", however long you need, and a 5 pound sledge, and let her rip. Thats how I did it.