066 muffler mod pics and results

[MOE]

I modded the muffler on my 066 a couple of days ago. I first drilled out the inner box. I then welded two 1/2" washers with spark arestor screen behind them on the front cover, then I tripled the size of the factory opening with my die grinder. I made a bigger hood for the factory opening so the gases still go forard. With the balmey warm temps of 5 degrees, I thought I'd better tune it and try it out. It made a pretty noticeable difference. It sound pretty cool as well. It's currently tuned by ear. If I get it on a tach what should my no load max be? Thanks

 

[Lakeside53]

13,000...

 

[MOE]

Ok, It's telling me the picture is too big, I'll see if I can trim it down.