I am going to put in a piece of flex pipe in place of my rotted out muffler on my Dart.

It is a temporary thing until I can afford a 2 1/4" manifold back pipe.

What ID flex pipe would I need to go over the pipe?

It is so ghetto! It will go with the "Wally World" Jr. bling plastic wheel covers, half moon headlight covers, and AAAOOOOOGAH horn.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

A cherry bomb would probably cost the same as the flex pipe and at least offer some muffling (in theory).

Measure the total diameter of your existing pipe and add 1/4 inch.

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Casually looking for a Clifford hyperpak intake for cheap.

my cherry bomb glass pak was 17.99 from autozone and it sounds amazing!

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"Marilyn" 64 Dart GT & "Stella" 64 Valiant V100 Sedan - 63 Norton Project

I just want something to slip on and slip off. The flex pipe wasn't cheap as that muffler! It may do double duty on the Duster 'til I get the money to reroute those pipes due to the reverse lever on the OD not clearing.

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick