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Are there any negatives to going to a 2 into 1 exhaust? Increase or decrease hp? Would I have to change jetting?

Or is there no changes but aesthetics? Bike is cb350 and 2 into 1 exhaust is called a "Mac".

Thanks
 

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The short answer is that both have been raced successfully. Go with whichever works for you for looks, ground clearance and availability. You might want to do a search since we have had some discussion about headpipe diameter and length.

Ken
 
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