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The Whole system is 3 inch diameter and, yes, it is very light.
I am betting that you will also pick up gains in HP and Torque although I need to check if they make any of those claims
That’s great to know. Are all the JCR exhausts 3” all the way thru? (Including the larger diameter tube on the valved setup) I know Souls non-valved is 3” too.