The stock mufflers don't do much. Most of the sound dampening is in the catalytic convertor. If you want to get maximum power increase...
I would think a 210 would fit? You can alter the wheel (or find one the factory used to sell) and get a 240 in there.
You are correct Steve. Here's a more comprehensive picture
I've never tried two and should not be needed. May need to remove and clean again.
We are going to be offering the 240 conversion wheel (widening of the stock wheel) since the OEM is discontinued. We have the first one...
Sounds like you need some adjustments to the steering bearings and not a band aid
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