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It's a just a pipe. Whether it is made by Pu Pu or Golden Jack, it will remain a pipe and doing the same thing - exhaust. Nothing super high tech.... just good and bad marketing!
The small diameter (incl cats), the higher backpressure = low revs added power
The bigger diameter (incl cats cells, or no cats), the lower backpressure or restrictions = mid and high rev added power. However loss of low rev power.
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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