You will have to remove the intake manifold to get to the spark plugs, Thanks let me know if you have more questions, ROY!
If you have not tried this intake before, I would not recommend this job it can be a pain even for us, I would have the dealer do it for you, if you damage something it will cost you more in the long run. I hope this helps, let me know if you have more questions Thanks ROY!
Thank you and Good luck ,let me know if you ever have more questions I will be glad to help you ! Thanks ROY