Stenner
New member
Looking to switch out the exhaust on my 2010 Mazda3 2.5L. A mechanic friend of mine suggested I do a 2.50 inch cat back exhaust. I searched magnaflow and their exhaust for the 2.5L GT that I have has a 2.25 inch cat back but their cat back for the 2.3L mazdaspeed3 has a 2.50 inch exhaust. The two cars are pretty much identical aside from the performance upgades that the Mazdaspeed3 has. Does anyone know if the cat back for the speed3 would fit on my Mazda3 GT?