I bought a Greddy Evo Muffler used from one of my friends and am wondering what to do about the exhaust pipes. Do i have to buy the same greddy pipes for it or will any pipes work and where should i look for just the pipes

You can use any exhaust pipping as long as you have the right size. Ex: 2.5" SKUNK2 Pipping Will fit a 2.5" Greddy Muffler Inlet.

It will fit any piping as long as same size

You can have a shop custom make it for you. It might be cheaper that way too. Just make sure you have it mandrel bent. If they can't mandrel bend, then you might be able to get the prebent pipe elbows and use that along with the straight pipe. Which ever is cheaper, or easier for you. It will work just as good as any name brand exhaust pipe. The only dif would be the quality of the metal.......fISH