tune pipe o/s outboard 21

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steve palgreene

Well-Known Member
Joined
Dec 5, 2009
Messages
96
I see there are o/s outboard 21 with tune pipes on them . Do they sell tune pipes for the outboard 21 motor where can you buy them if so .
 
in my humble opinnion i test my olds xm21 with htb silver bullet and rossi pipes blow 65% nitro, no more performance than original mufller. i think to be obtain more power i should be work on sleeve times.
 
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