I used the stock clamp for the oval part. Just squeezed the boot to get it on the intake manifold. Not sure if that is what you are talking about. The pipe fit pretty tight into the boot but it went. My maf sensor ended up on the bottom near the ac line. It took some adjusting to get it to clear the hood thou, I finally got it figured out now but got some scuffs on my shiny intake before I got it figured. The no limit writing on the boot is clearly visible and pretty much centered from the front the way my boot sits. I used the silicone hose to replace that factory metal mess that comes from the secondary coolant tank as well.