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Hello

My Mac exhaust has a cross over. Afriends aftermarkets on his 85 does not.

What is the Importance // purpose of the cross over

Thanks Old sarge:?
 

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This has been discussed a couple of times before with no clear consensus. On my vintage cars I always install a crossover when I change them to dual exhausts. It helps the scavenging effect of the exhaust flow and helps to prevent reversion or backup. It also mellows out the exhaust tone, especially at higher revs. Whether to install a crossover or not can depend upon the number of cylinders, the firing order, and whether the exhaust system has been tuned.

I could say that Honda put the crossover there for a reason but that has proven to be false in any number of other things that Honda has done.
 
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