any particular reason why you want to go 2.25 inch and not 2 inch?Originally Posted by **Ghost**
you will notice that mugen only make a rear muffler for the EK4.
Mugen believe that the stock piping is good for around 200hp before it becomes a restriction.
I believe 2 inch mandrel bent piping is a good system, any higher and you'll end up losing response and low end torque
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