Update

I ran a few more tanks through my Modded NX, and my friends stock NX back to back today. They both now have (3) 16 oz tanks ran through them. The fuel today was 20% again. The plug was an OS#8, after the stock plug blew right off the batt with stock muffler in the stock engine. The stock mufler ran like total crap, and the testing was terminated at the beginning of the second tank. It ran like it was way rich, and you could not lean it out, or it would sag. I killed the engine, and checked the plug, and it ws half dead. i installed a New OS8 and the Jett Mufler. The same Jett Muffler and Sundowner 50 spacer by Jett was used for both engine runs, since we are waiting for the other one in the mail yet.

Stock .60 NX w/stock muffler
APC 10-8 12,800 Peaked the RPM, but the engine acted way rich and was hot. Fried the plug.
APC 11-6 12,600 Peaked the RPM, but the engine acted way rich and was hot. Fried the plug.

Stock .60 NX w/Jett muffler The engine was instantly transformed. I said there, do you believe me now. My friend pitched the stock muffler for the dumpster.
APC 10-8 15,200 Peaked
APC 11-6 14,800 Peaked

Modded .60 NX w/Jett Muffler
APC 10-8 15,500 Peaked
APC 11-6 15,200 Peaked
MA 10-7 15,900 Peaked "Buddy ran for cover as he thought it was going to blow up (Very noisy), and I was not sure myself that it would not myself. I just did not want
to chop my arm up with shrapanel this time. I think I could of squeezed another 100 out of it, but I was not going to chance it.

The conclusion on the Modds are still a little unknown. The engine is stronger by little, but I do not know if it is worth the time to do it. Mine does seam to be a little snappier down in the low speed throttle responce area.