I have the CP-E. If an intake says it's for MTX only, there could be a chance that the thing just won't physically fit. The ATX and the MTX might have different dimensions. If it says it's for MTX only, it probably won't have any mechanical issues being installed on an ATX, but you might not be able to get it on. I don't think that's an issue for the 6 though.
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Hmm...but considering where the intake is mounted, there's a good chance that's not the case though.
Intakes tend to be universal fits, only varying in design across different engine sizes.
The engine bay dimensions are the same on both transmission types, since they sit below the engine.
You can also tell because manufacturers rarely specify whether a part only fits on a certain transmission type, unless it's a clutch or something obvious like that.
Did the product actually say "for manual transmission only" or "for Mazdaspeed (blah blah) 6 spd manual"?
man if i get that thing for my ATX i think my dealership will void my warranty ><
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This one's been discussed about a million times

but they can't actually void your warranty unless a non-OEM part causes a break down. For example, if you hydrolock from installing a CAI, they'll likely throw the owner's manual at you. A dealership can, however, deny you service for having any non-OEM part on. Although this is pretty rare, since they often can't even recognize a CAI when they see one, you'll have to pick and choose between dealerships. The guys at Morrey Mazda are pretty nice, as well as Wolfe Langley. What I always do is make some friends at the service department through a series of small talks whenever I'm there for something. It's a nice guarantee
