Just run 2-1/2” to 2-1/4” reducers right before your current 2-1/4” mufflers and you’ll realize the performance boost from the new 2-1/2” mandrel bent head pipes. The gasses have cooled enough by that point that the 2-1/4” mufflers will handle the gas flow.
Reducers with a smooth transition in the shape of a cone are what you’re looking for.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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