well if you go for factory style pipe it is still shitty rubber and is ribbed, if you want the best "custom intake pipe" go to a local muffler shop and ask them to bend some scrap pipe for you. most places will do it for a few bucks then get some rubber connectors and you have a nice intake (i would go with 2.5in pipe) also if you want the air to be a bit colder or worry about the pipe heating up take it to a place that does spray on bed liners for trucks and ask them to give you a quick spray on the outside of the pipes and that will insulate it from almost all under hood heat