There might be enough room on the inside between the risers and
the tips to install the Eddie Marine 4" shorties...that's what I'm
thinking.

Ask mike about his bolt IN mufflers he has for the 21!

What happened to the stainless 4 inch I had on the back?

I did get the stainless mufflers with the boat....I'll only use them
if I have to!

I really liked those mufflers.LOL made the boat sound tough but still nice and quiet so the cops werent bothering me.

It was still pretty throaty with them on when running.