what the best cold air intake for my 91 civic si with a jdm b6 swap and where can i get it from

 

Depends on what "best" means to you. Where is your battery?

 

my battery is in the back of my car

 

which intake will give more power right now i have a really cheap intake on my car

 

look on ebay.
an intake is just a metal tube. name brands and stickers do little to nothing.
go on ebay and check to see which way you want the tube to bend.
bottom line is all of them yeild about the same horsepower increase=1 (=or - 2)

 

Any 88-91 Civic/Crx Si intake will fit

 

check my sig