Welcome to the world of augmented performance cars.
I won't get into the nightmares that I've encountered with smogging my 1983 911 with a 3.6L 1989 engine. there's not enough time in the day... or enough room in one post to go into details.
What I can recommend to you are these simple ... not inexpensive... steps:
1) Make good friends with an authorized/qualified Porsche shop and mechanic.... I mean
GOOOOOOD Friends. Talk with them extensively regarding the mod's your car has, what you might need to do to get the car to pass visual and diagnostic smog tests (no more "sniff tests" for cars 2000 make and later unless under special circumstance... just a OBD reading from your computers), and what you can do to save some $$$ by doing some of the wrenching yourself.
2) Have the OEM parts for your car ready to put back on the car... if necessary... to pass visual inspection. You can get used parts thru lots of sources (Craigslist, eBay, local dismantlers, shops that remove parts from their clients' cars and sell them... etc). Be sure the parts are right for your car. Hint: Cat. Converters have numbers stamped on them that coincide with a year/make of a vehicle. A really A/R Inspector could run the cat codes and fail your visual for not having the right cat. converter for your year/make car. (and no... you cannot ask me how I know. My anger management counselling fees are already too high!!)
3) Discuss having your Porsche Technician take the car to a smog referee to determine what you need to do to be in compliance. Sometimes the ref.'s are understanding of your situation and will work with you to be in compliance.
There are a couple of shops that advertise in the Windblown Witness. Call them all and discuss your situation with their top wrenchers. They will steer you in the right direction.
I currently own 3 exhaust systems and 3 intake systems for my 3.6L. Yep, one set of each is strictly for the 2-year "Bend over and pay your smog dues" event that my proctologist giggles about every other year.
You may need to stockpile the needed parts for smogging your car. I'm not the only club member that does this. You may need to do this too.
I do as much wrenching on the car to install the "smog" parts as I can. I save my mechanic a couple of hours by doing the easy stuff myself. The rest is up to him, and we have the drill down to a bit of an art. I still don't get off cheap for all I have to do to pass smog. Not by a looooong shot. It's the price I pay for outstanding performance from a 30+ year old car.
If this all sounds too "unpleasant" ... buy a Prius. Otherwise, enjoy your modified sportscar, and try to smile when the square peg meets the round hole.
That's my take on your situation. Others may vary. I wish you good luck. Drive fast, take chances.