Pioneer P9400MP will this fit the S?

and what other pionners will fit??

 

Looks like it will to me. Most single DIN units should.

 

From my knowledge that the front panel flips downwards when loading a cd (somebody corrects me if I am wrong). Will the front plate hit the stock door where the radio is hidden?

 

That unit will fit. No problem.

 

I just bought the same deck a few days ago and probably will install it soon once I get all my parts. I've gotten feedback from other owners that this deck should have no problems. I will update once I get it installed.