We have had some experience with the 86 pipe on off road cars here, with fantastic performance results, however it does make the car much harder to drive as the engine becomes a lot more potent. The 063 is a great pipe that has almost the same power as the circuit pipe but is very smooth and easy to handle. You will also get much better fuel economy as well.
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Concerning the polished and not polished pipes, it seems the polished pipes make the engine run a little better but this is just a feeling.
When we measure the difference on the bench the power-output is the same, however the noiselevel of the non-polished pipe is lower, this can also give the impression of less power.
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