There are some seats that will fit, rear facing is definitely tight though. I originally used a Recaro ProSport I had in my Cayman but that did leave the front passenger seat a little tight. As the base was wider it would not sit all the way back at the bottom. Have since purchased two Porsche brand "KID Plus" seats and those work great. Fits perfect in my 997.1 and because the back height is adjustable they work for both my 3 and 6 year old (front facing).

 

I used the following one, which fits perfect for 997. Just sold mine 4 weeks ago, coz my daughter is now tall enough for the child seats in the back..

http://www.kiddyusa.com/childrens-ca...orld-plus.html


Keep in mind during the first year u must use a special baby carrier which should be placed on the front passenger seat. Turn of the airbag as well. Safety first.

 

No, no the Kiddy fits.
Been using it for 6 years, including holidays. But, of course only in the coupe. I`ve not tested the Porsche seats.
Btw:
The Quinny Zapp is the only buggy that will fit in the Trunk. There is no alternative!
http://www.quinny.com/strollers-bugg...-xtra/#product