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You're making a good decision. I've altered my shift points as well to compensate for the same resonance issues with my Che muffler. However, shifting higher all the time uses more fuel and is hard on the motor over time. I'd rather not sacrifice my motor and stressless driving style around town for the sound of a loud muffler.
I'm going to get a shop to weld bypass pipes on my factory muffler and put it back on the car when I can find the cash to do it. I love the sound of my aftermarket muffler, but the thing gives me banging headaches and my ears ring after I am forced to drive around with the top up for a few hours in town.
Loud and resonance-free just don't go together on our cars for less than six or seven grand.
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