Ok so pretty much

MP3 = racing beat exhaust which is a cat back

Mazdaspeed = Axle back exhaust that will fit on my sedan

Now, if I but the whole exhaust of a used mazdaspeed, the only thing that will fit will be the axle back exhaust, and maybe the resonator...that means the exhaust off a mazdaspeed is 2 pieces.... muffler, and resonator that connects to s pipe

Now, mp3 used exhaust contains three pieces resonator , s pipe and muffler and non are connected right?

Lastly is my LX PIPING bigger or smaller than a full mazdaspeed exhaust? will the whole exhaust even fit or just the muffler

 

Are you talking about the Mazdaspeed axle-back, or the Mazdaspeed Protege's exhaust? I'm so confused now...

 

mazdaspeed proteges exhaust!! It is an axle back right?

 

I am an owner of an MP3 the exhaust system that came w/my car is a 2.25" axle-back. that sytem was made by racing beat. There are multiple cat-back systems out there that are made for the protege and are bolt-on. Apexi-N1, Magnaflow, Borla, Mazdaspeed, Ractive, and more. Yes, MAZDASPEED does make a cat-back system on for the protege and it will bolt on to the protege fine. I hope that helps you

 

Yes and No mazdaspeed's have the cat-back exhaust system and Axle back I believe the axle back was used on the first Mazdaspeed Proteges built. (don't quote me on that, I think that is right), the MP3's only have the axle-back.