Depends on where you go. It is a lengthy process, and requires a lot to get to it, and knowledge on how to do it. Do not go to someone that hasn't done it a lot. It isn't a standard service on many engines, and requires a skilled hand to get it right. Clearing the carbon from the EGR system, and cleaning the carbon from the Throttle Body should be done at this time as well. A good Honda mechanic can do all this in roughly 3-5 hours, and most it is more. Expect to pay at least $500 to have these services done all together. It isn't parts it is labor. About $10-50 in gaskets, and another $10-20 in cleaning material. If the mechanic doesn't know how to do it, they will make it worse. You have to be real careful who you let do this job. You can do it yourself for a lot less, and learn a new skill in the process. Being your vehicle, you will take a day or two to get it all done correctly, and learn a new skill in the process. There are great write-ups and videos here to help if you want to go that route. There are many people on here that had to do it themselves, because the mechanic they paid did it wrong, and made things worse.
