04-09 Mazda 3, 2.3 CorkSport Header!

i believe that they are interchangeable yes. (i BELIEVE. thats what ive been told so unless they lied lol)
 
Damn guess Corksport never made one. I will say that this seems to be a very complicated matter though (design, installation, emissions variants, etc). I've been searching the last few days for a good 4-2-1 design to go with my stock exhaust and track pipe on my 2.3 liter PZEV, but it seems like a mostly problematic area.
 

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