ORIGINAL: turbo.gst
If my memory serves me well, the hole spacing is the same as the K&B Sportster .20 & .28 I use to try every muffler on every engine I had. I did the same thing with the carbs...
turbo
I usually end up buying an ST .23 w/muffler just to get the muffler to use on my ST G20/15 engines.
I completely forgot that the K&B Sportster 20/28 muffler would fit those ST engines. The good thing about the K&B mufflers is that they offer a boost in power of just about all stock mufflers. Plus they are quieter than other mufflers.
Ed Cregger