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If I remember correctly K&N and R2C are priced the lowest but still aren't cheap.
Are you thinking like cheap cheap? eBay has some things under $150 I wouldn't go that route though.
You can get almost any G37 intake for that range.
There's a few vendors on here who run promotions or offer lowest prices, I'd search for some sound clips here and on youtube, find one you like then hunt it down.
300-500 is cheap? lol. I think long tube is a way to go. Stillen or Takeda. Takeda is easier to install thats why I got it. Still was pain in the a** since bumper has to come off. R2C should be easy one.
How about just get the K&N drop in? The factory air box has pretty good design already, and it's drawing cold air as well.. Definitely cheaper than most replacement intakes.
