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WTB Iriwin 3.5 OS outboard pipe

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Robin I dropped to the ball on the carb tomorrow it will go I am truly sorry.

I have no idea if it's stamped or not the old websits that I have seen show a os version Iriwin pipe. That's all I know I am new to the tunnel stuff.
 
Would like to try on os and also to have for something else.
 
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You dont need a pipe on the 20 O.S. just get the right prop and set up i used the Grimm prop 42/53 2 blade very nice prop
 
We have run the same boat in sport and mod with an OS .21 switching the pipe to the stamped Irwin. (2 bolts) In testing we didn't see a large difference in top end but lap times were better, due to low end acceleration of the Irwin. Your not going to get the performance of a Nova but will hold a lead easier if you can get out front.

Mic
 
Cool have fun testing
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