Use OEM.

Some non-OEM filters are larger diameter and therefore sit closer to the exhaust manifold.

If you have aftermarket headers, the non-OEM filter will sit almost up against the manifold...as you'd imagine, this isn't good

fram

Yeah, I do plan to use oem, but I wasnt asking that. Becxause Im not changing it over
Just want to know the size of it, thats all.

and no, I cant get the stone guard off without jacking up the car, its a hassell.