Saving Old Seagulls

I have a 100 century exhaust tube that is banged around and want to replace it with a spare from what I have been told is a 102 exhaust tube that may polish up ok. The 100 tube has 2 holes drilled in it and the 102 tube none. Would the water passage fitting on the 102 tube be enough/ or to much venting for the exhaust or should I just plug it and drill 2 similar sized holes like on the 100 century tube? Some may think this is a silly question but I hate doing things twice then find out I stuffed up both times.

You might find you only need to fill 1 hole in the 100 tube. Enlarge the lower hole so you can fit the 102 water pipe, and what's left you fill.
Measure twice drill once.


Jon

Not talking about the overflow hole in the drive tube ?