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Old May 11, 2011, 11:30 PM
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cannondale1974's Avatar
Lexington, KY
Joined Oct 2009
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What size tuned pipe for a .61?

Looks like Macs gives me a couple choices, an 8.5cc for 45-60 size motors and a 10cc for 60-75 motors. I'll probably end up with an OS .61 which size tuned pipe would be the best or does it really matter?

Here's the chart from Macs website. http://www.macspro.com/tunedpipes.asp

Thanks guys.
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Old May 12, 2011, 05:07 AM
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Kansas City
Joined Apr 2010
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1 cc equals .061 cubic inches. You have a 10 cc engine so use the 10 cc pipe. I have used Macs products for years and have had zero quality issues.
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Old May 12, 2011, 10:49 PM
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downunder's Avatar
Adelaide, South Australia
Joined Sep 2003
3,082 Posts
The sizes listed are simply the engine size in both metric (cc) and Imperial (cub inch). Personally I'd just go for the stock #1060 Quiet pipe but remember you have to also get an exhaust header as well.
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Old May 12, 2011, 11:01 PM
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cannondale1974's Avatar
Lexington, KY
Joined Oct 2009
701 Posts
Thanks guys, I've used tuned pipes for years and currently have an OS .32 on a tuned pipe. My local hobby shop has a Macs pipe on the shelf for an 8.5cc so it's a little confusing since their website says both the 8.6 and 10cc will work on a .60 I may give them a call and get their input as well.

Thanks.

ps: I don't want a quiet pipe, I want to hear this thing.
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