I didn't order a specific brand as they are all exactly the same. The one that I ended up getting is a TOP. I added a .1mm shim to the existing shim, although Mugen USA claims I do not need to add a shim. They routinely run 40% nitro and claim they add no shims. I do not get free p/s and conrods, so I decided to err on the side of caution. The other reason I decided to do this, is because the engine O'Donnell sent me (Nova NS12S3A1) which is basically the same, he added a shim before he sent it to me.
| Capricorn | Ybslow | Proline-Protoform | Johnny Bravo Racing | Desoto Racing | Murnan Modified | Matrix Tires | Powermaster Fuel |