Hi Toby,
Sorry, I don't have PSE on my Cayman but it can be retrofitted - price between £450 and £500. You should get a 10% discount on parts from a Porsche Centre.
Jeff
Oops! Misread your post. As others have said I would expect something around £2k, dependent upon who supplies and fits it. As an alternative you could consider having the existing exhaust modified by Carnewal for a very reasonable 450 Euros http://www.carnewal.com/products/981/p81001/981-Carnewal-GT-Exhaust
Sorry, I don't have PSE on my Cayman but it can be retrofitted - price between £450 and £500. You should get a 10% discount on parts from a Porsche Centre.
Jeff
Oops! Misread your post. As others have said I would expect something around £2k, dependent upon who supplies and fits it. As an alternative you could consider having the existing exhaust modified by Carnewal for a very reasonable 450 Euros http://www.carnewal.com/products/981/p81001/981-Carnewal-GT-Exhaust