muffler clearance

[Super Shredder]

what is the maximum dimension of a muffler fitting for the speed6. the magnaflow 2.5 system uses a 4x9 oval 20 inch muffler. how much bigger can you go?

[coyfish]

Are you going custom ??? You can fit some pretty huge mufflers in there.

[zinger002]

why do you need something so big?

[Super Shredder]

i just bought the same size they use on the 2.5 kit just with 3/3'' inlet outlet

[LBV]

I've used both 4x9 and 5x8, they both fit.