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I want to put a 3 inch downpipe on my 89 daytona shelby. It's a 2.2l and has the 2.5" swingvalve. My question is will a 3" aftermarket exhaust flange and donut gasket fit the stock swing valve?
 

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I run a full 3", inexpensive custom made downpipe with no donut.

It runs fine and has been leak free for 10 yrs.

Thanks
Randy
 
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