How you doing? Replaced mine at 25,000 along with a valve job. Did notice that the valve cover was leaking from several areas, not just what could be seen prior to tackling the job at hand. Mine had the standard air box but after removing all that #hit went back in with Ramair. Some folks on here do the entire job in the matter of hours. Myself I took about two days. Then again at 35,000 no leaks. For what it is worth. Followed the shop manual to the letter. I do not know how you all fair with the local dealerships in UK but here in the states most of them suck. A really good torque wrench is required. Really not that hard to do. pretty basic.