Quite a lot. You'll need a new tune for the new exhaust.
different piping, diameters, bends, lengths, velocity etc = needs new tune. slip ons, as long as they are about the same dimensions, are the same thing but with full systems it's a bigger changeCool, thanks. I wasn't sure if essentially one open system equated to another. I could see it going either way which is why I wanted to make sure.
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