I read the article Tim. Look at what matters which is the parts list. To tout this easy and cheap way to install a spin-on filter without bothering to add everything you need in there is sort of deceiving.
For example putting it in the location they chose (me too) you can't just put the rear hose on and connect it outright without a big concern of the hot exhaust melting your hose. To get around that, a 4 inch pipe with a tee (so you can also put your sensors on the tee) give you clearance so the 300 degree rated hose does not touch the 1200 degree exhaust. I wouldn't sell them that way for sure.
