Hi! this is my very first time posting on this website, and I got an inline 4 accord coupe that I would love to increase the horsepower of. I was planning to do an air intake (my friend is helping me, he's really good at modding) but I don't know what's a good one to buy this one:

Stainless Washable Filter Cold Air Intake 08 11 Accord 4CYL 2 4L Black Aluminum | eBay

Will that be good for my car? I know that you can get ones that are 300$, but my friend said the cheap one pretty much does the same thing. I was also told that I can install a header, but I couldn't find one, does any 1 know if they make header for 2011 accord coupe i4? and if yes can you please send me a link?

I was also told that I can do a full system exhaust, I don't know which one to get. Also I head that I can also do camshaft, but I couldn't find one. Can any one send me a link to one please?

Thank's a bunch. and I'm not worry on installation since my friend can help me install them.

I wont do all of the adding right away, but I am willing to spend about 200$ each time (except for the intake), per year or something haha.

I am a noob at all this modding stuff and sorry if i offend any of you guys with my car stupidity.

PS. Oh and i've got 190 horsepower, I would like to get to 250+
and please attach links for installation parts I should get!