When I removed my pipe to fix a broken vacuum tube, I noticed that one of the nipples on the K&N tube was covered on the inside. It seems that when they wielded on the tube and then grinded down the excess, it covered the hole. I had to use a small screwdriver to puncture the hole. I advise that you take off the pipe to do this, or else you will have the particle in your intake... not a good idea.<p>It's probably just a fluke on mine, but if it happed to me, it just might happen to you. I didn't notice until I actually looked at it. I did not feel any difference before and after, however, one of my vacuum tubes split at the end. It was a stock tube (not the ones provided with the kit) connected between some sensor and the T connector that was part of the tube assembly that connected to the inner nipple, strangely enough.<p>Anyway, I just thought I'd let anyone who had it to take a look.