I've heard of an NES pirate of Super Mario Kart for SNES

[AnimalCrossingX]

Is there an actual ROM like this? I know about the SMW NES ROM, but does this one exist?

[Jale]

I'm not really sure. If you are looking for the ROM, remember that you can't ask for ROMs, hacked or not, but if the hack is a patch (that can be inserted into the original ROM) then yes, we can help you.

[Xiedo]

There's a Top Rider hack, yes, with SMK characters. But its not a SMK hack. That's all I know.

[DraigGwym]

I think you might be thinking of KART FIGHTER, It had all the characters for Mario Kart, But it was a fighting game and considering the Nes' hardware, Not a bad hack at all. Here's a couple screens. Note the title pic. :}

[AnimalCrossingX]

I know about Kart Fighter...Anyways, is it a patch for Top Rider, or is it an actual ROM(and no, I'm not asking for it)?

[Xiedo]

I only know of the hacked ROM.