Ok so I've been searching threads and it all comes down to no one really knows the restrictions for the nc50 Iowa.
I recently purchased one and really love it but the 25mph limitation is starting to kill me inside slowly. I have adjusted pretty much everything possible. Also I want to keep it as stock as possible. I did watch some videos about drilling out stock muffler on YouTube. I too out like 27-28 with doing this.
I did notice that the exhaust outlet port on mine is different from some of the others I've seen. Mine looks like the right one. Picture below. Should I port it out and would it help. Also if any info on the actual restrictions would be great.