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

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

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.

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

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. :}

http://newdraconia.no-ip.org/~adraga...itleScreen.GIF

http://newdraconia.no-ip.org/~adraga...CharScreen.GIF

http://newdraconia.no-ip.org/~adragan/HELPPIX/FIGHT.GIF

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)?

I only know of the hacked ROM.