Do they fit? And what N/A header do u guys recommend??

 

it's going to be a tight fit against the oil pan. how much do you want to spend on a header?

 

I wanna spend up to 150usd..

 

well then you arent gonna get anything good. hit up ebay.

 

it won't fit right, the deck hight of a b16 is lower then the b18, so it will hit the oil pan and not sit correctly on the head.. and as snoop said u ain't going to get anythign nice for 150 bucks.. save your money and get something worth while or leave it stock..

 

How much should I spend on a header and what brands are good?

 

depends on how much power you want to make. brands like dc, greddy, comptech, etc. all make similar hp, which is to say not a whole lot. but they're cheap and get the job done if all you're looking to do are basic bolt on's.

companies like smsp, rmf, ssr, or hytech, build custom headers if you're looking for an all out all motor build but they come at a premium. starting at $600 and going all the way up to $1300usd.

cheaper alternatives but still giving good results are the jdm itr 4-1 or rage tri-y. these range from $200-600usd depending on where you look.

 

Ok, does the oem itr B18C header fit correctly on my B18A?

 

The B16 header is too short to clear the oil pan properly due to the different deck heights, and the GSR header won't bolt up to your cat. You need an LS or Type R header.