Regarding the air injection removal kit, I purchased mine from jenksbolts.com in the UK, It was delivered next day. I went for the black cylinder head plugs as they suit the black engine. Fitting was no problem, I did have to fabricate a deep socket (welded a bit of pipe on to an old 13mm socket to remove the injection pipes in the cylinder head) as there is not much room to get a spanner in and I did not want to scratch the paint. My dealer also opened up the pilot air screws for me when he fitted the pipes, you need a special "D" tool. This mod stops the pipes discolouring and also stops the poping on the overrun when you have off road pipes, I believe it may also let the engine run a little cooler round the head. As you are in the UK if you wish to borrow the socket let me know.
