3" is unneeded. You'll never hit the power levels with a supercharged LD9 to utilize it. 2.5" will work just fine and help it sound alittle better.
its an old concept. time for something new to take the reigns. - Z yaaaa
I agree. Even if you were making 225 whp, I would still use a 2.5 inch exhaust. If you make 300 whp, then a 3 inch is not a bad idea.
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