Originally Posted by Chris Peralta

The turbo plug will give you a little more power as well as a little better fuel mileage. I like turbo plugs because the seem to last a lot longer than normal plugs. As for the shims, you do not want to remove any shims running in Atlanta. The engine is shimmed for 25% nitro right now, you can probably run 30% and also be fine just make sure you have both shims. To get a little more snap from the engine you can try several things. First try 1.0 springs instead of .9 Then you can try the 198 header instead of the 192. Finally if you still need more bottom end play with your gearing. Make sure you take your time breaking it in again and you should get many more gallons thru the engine.