£375 for 6 x spark plugs 997.2 C2S?????

[FZP]

Just got quoted the above price for spark plugs from OPC as part of a service.
Does this sound right?

[FZP]

So I dropped it off today and the OPC confirmed that they remove the rear bar, exhaust boxes, heat shields and exhaust manifolds to get access.
Approx cost of the plugs was £56. The rest was labour.