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just get the full-meal chinese deal (fabspeed knock-off) - headers, mid-pipes, muffler, and put it on. it is cheap. if headers don't fit you can buy another set and still be ahead of a fabspeed setup. if too loud then put your oem muffler back on. if there is drone, look to improving the clamps used.
your car needs the second set of o2 sensors for emissions purposes. not sure what you have for emissions testing where you are, however solutions to removing your cats (with varying success) are:
- have a shop push the 'rest of world' (row) tune onto your car. this is not a performance tune, just the ecu map porsche uses for cars outside of north america. it will not throw a cel for missing emissions equipment. if the dealer has the proper porsche computer to do the work it'll take all of 10 minutes of shop time. you'll need the programming codes for your car to do this.
- get a cheater. some people use a spark plug extender socket. the idea is to get the sensor out of the direct stream of the exhaust so that the computer thinks the cats are there and working. the really expensive cheaters have little cats in them.
- just tuck the sensors up under the car. they will read fresh air and think the cats are working.
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