Mid Muffler
You dont want it to be a chamber muffler because it will slow down the exhaust flow

You want a strait through like this

it can be slanted, but as long as there is not chambers your fine

You want a strait through like this

it can be slanted, but as long as there is not chambers your fine
that size listed above should easily fit because the mid muffler is giantic. There are also some slimmer versions that will fit even better. Just look at some aftermarket exhaust and look at about how big their's are and you should have a good idea


