I was thinking of replacing the airbox with a cone K&N filter. I have read that our cars don't take well to intakes but this is just a cone and keeps the stock intake. Will that matter and is it doable? I did the silencer delete mod, I just want more turbo spool sound. I'm not looking to spend an a$$ load of money so I thought this would help. By the way I have a stock 04 REX.