if the 4-2-1 has a 2.25" collector (this is the bit that u connect to the cat right??), can u just replace stock header on an EM1 b16a?
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if the 4-2-1 has a 2.25" collector (this is the bit that u connect to the cat right??), can u just replace stock header on an EM1 b16a?
yeah you should be able to.
:)