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With an electronic micrometer, you can clearly see the advantages of the 3-inch Thermal system over its 2-1/4-inch counterpart. The O.D. on the 2 1/4-inch system checks in a 2.243
Dyno Cell: Is Bigger Really Better?

 With an electronic micrometer, you can clearly see the advantages of the 3-inch Thermal system over its 2-1/4-inch counterpart. The O.D. on the 2 1/4-inch system checks in a 2.243  View Related Article

 

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