You still have to cut the hose that goes from the water pump to the heater valve, install the tee that comes with the kit and route that to the filter. Either way, like I said, without getting the IPR kit with the manifold, you're going to be splicing.
Post #18 of that thread they indicate thread tape or sealant is not required on NPT threads...but that they are using it as insurance. That's the silliest crock of garbage I've heard all day. I would say 99.9999999999% of all NPT threads require tape or sealing compound of some sort. There's a reason it's sold in the plumbing sections of all hardware stores and that reason isn't...."for insurance". Personally I'd be leery of purchasing from them.
Take a look at the powerstroke threads about these guys in the following link. Consider yourself warned.
Performance Machine Manufacturing Reviews
Some more good info. Noticed what's highlighted in red bold letters:
"Sometimes NPT threads are referred to as MPT ('Male Pipe Thread'), MNPT, or NPT(M) for male (external) threads; and FPT ('Female Pipe Thread'), FNPT. An equivalent designation is MIP (Male iron pipe) and FIP (Female iron pipe). Also the terms NPS and NPSM are sometimes used to designate a straight, not tapered, thread. This should not be confused with NPS, meaning Nominal Pipe Size.
NPTF is pipe thread "fuel" often used in hydraulics. A taper is cut on the id of male pipe to accommodate metal to metal seals using swivels. NPSH is straight thread using the same pitch, thus NPSH female fittings are often used on NPT male fittings to have hand tight gasket sealed fittings to adapt to other thread types. A good example is adapting to NST for fire service.
Sometimes these terms are used:
MIP: stands for Male Iron Pipe, or Male International Pipe, or MPT Male Pipe Thread. It is a term for pipe fittings.
FIP: stands for Female Iron Pipe, or Female International Pipe, or FPT. It is a term for pipe fittings that MIP fittings fit into.
The difference between FIP, MIP, and Compression fittings is in the tapering of the thread. FIP has taper of 1:16 (6.25% slope), compression has taper of 13:96 (13.5% slope).
A female iron connection has a tapered thread, which thins out to the end of the pipe. As the fitting is tightened, the ever-decreasing thread depth means that the connection becomes watertight. To properly seal the fitting, paste thread sealant or PTFE (polytetrafluoroethylene) tape more commonly called Teflon tape, wrapped around the thread is required
Now, one could argue I made all that up, or they could google "NPT thread tape" and read the wiki version which is verbatim. Again, I'd be leery of a company who has no idea what they're talking about.