Ok... that first intake is probably the worst design i've seen. It looks like a piece of regular pipe welded to the rear half of a performance muffler. Looks ghetto to me. I'll bet that bend just kills power. I say you're better off stock and should sell that thing for scrap metal.
Now look at the nice '' smooth '' design of the J's Racing intake... That is quality!

 

J's :boink:

 

i'd go with J's racing. ...or their knockoff :rick: