Catman

I pinched the leading edge of the pipe down from approx a 1” diameter to less than 1/2”. It lessened the water spray out the back. Might of helped top speed also.

The CLR for those 45 degree tubes is 5.5”. I bought them from Summit.

Thank you

I did think about doing it that way, but decided not to because of the swim deck clearance. I did not want to raise my swim deck. It just looked like it would be extremely tight. You would also have to use really tight radius on the tubing. I’m sure someone could make it work.

Sorry, I have been out all summer enjoying my homemade surf tabs and exhaust system.
Yes, the extra room is great, especially when changing the impeller on the raw water pump. I put 85 hours on it this summer and it is definitely quieter than before these modifications. I debated a lot on wether to put those flappers in my exhaust vs. keep the muffler. I did not want any chance for water to push into the engine.  I finally decided to install them, thus I deleted the muffler. I’m very happy with the noise reduction inside the boat and while surfing. My only downfall of this modification was that I lost 1-2mph on the top end. This is a result of the drag of the exhaust down pipe producing drag, it’s not a back pressure problem. I have modified the down pipe from my first design to reduce the drag.

I need to order the pipe, so it may take 2 weeks before you get it. I will order it today.

2 hours ago, jtryon said:

The 3.5” formed down pipe would be awesome because I’m sure it will be hard to get an exhaust or fab shop around here to make that exact piece.

What length would you need? I started with a 12” long piece of 3 1/2” oval tube. Would you want the the weld-on end to be 3  1/2” round? And the outlet end the same shape as mine? Can you make the cuts shown in the photo?

Fellow Wakegarage guys,  I appreciate the positive comments.

jtryon,  Yes, I did make them for this project only. My buddy and I actually made 2 sets of wood dies, one set for the 3” oval tube I did not use, and another for the 3 1/2” oval tube I did use. A set consists of: one round and one v-shaped oval (last photo above). I threw both 3” oval dies away already. I gave the 3 1/2” v-shaped oval die to a friend, because he was going to possibly do a similar down pipe for a Moomba. Do you just need the dies? Or a formed down pipe?