Gil,I second the AB .84 but it's recommended to open the baffle for this size of engine...mine is running well with it.
It is the standard Andy Brown 84 parabolic pipe. You drill out the internal baffle inside the stinger to decrease the back pressure and let the pipe breathe. Take a drill bit just a tiny amount smaller than the ID of the stinger and drill the baffle out through the stinger.. Do not drill out any of the stinger itself. Then flush out the pipe in running water heavily from both directions to get out all of shavings. I will usually fill the pipe up with water and shake it up hard and drain it out. It takes about 6+ times to flush it well. If you do not get them all out, your engine will eat them and it will be toast.John, please explain open the baffel, drillled the baffle maybe a pic of the pipe? thanks, Rick Lindow
John, I have a new RR 2011 80/101 starting with a cmb 80/ 84 parabolic . pipe set @11.75. that i have not ran yet, maybe two weeks. ive looked through this pipe the stinger is the same size inside and out (iner stinger /outer stinger) i bought the pipe on iw sold as new,pertnear!!! you can look down the pipe and see through it correct? Rick L.
You may be able to go in to 11 1/2" on the pipe. Try 11 3/4" first and if it runs well, try 11 1/2 and see then.John , i bought it first of 2010 red head 80 rs-h may be an 2009 MOD through Stu B.RICK L.
John, i was wrong in what i posted earlier,my pipe that i got off of i.w.has not been drilled! i was thinking of the wrong pipe, head up somewhere! you all where talking about 91s in the beginning , i think i should run the 80 first and then see what happens,i all so have a( CMB AB 67/80 MUFFLED),(13 CC MACS MUFFLED 1389 OPENED TO 1") any thoughts ,
Rick,John, i was wrong in what i posted earlier,my pipe that i got off of i.w.has not been drilled! i was thinking of the wrong pipe, head up somewhere! you all where talking about 91s in the beginning , i think i should run the 80 first and then see what happens,i all so have a( CMB AB 67/80 MUFFLED),(13 CC MACS MUFFLED 1389 OPENED TO 1") any thoughts ,
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