Yes, you must provide for absolutely no kinking, meaning you must sometimes figure out a new method of retaining hose when it runs somewhere other than where it did before. My heater core hoses now run closer to back of block rather than at the firewall hence the need for a strap to hold them away from exhaust pipe.
I use ATX cooler line for the smaller OD hoses which lead to another problem of cost. The hose is almost as high as the custom hoses are. I started patching in pieces of 5/16 or 3/8 steel brake line to make up much of the length then use the expensive cooler hose in 4-6 inch lengths at the ends to keep the cost down. The steel brake line can easily be bent to change direction too, and much cheaper than copper. Done correctly and retained with plastic wireties it looks good and neat, not trashy, just immediately evident it's not stock. I don't hesitate to drill another hole here or there in the upper radiator support for another tie strategically placed.
I use copper where I need it, the three way plastic manifold at top of radiator has been replaced with a copper part I soldered up, 3 of them running now on three cars and 100% trouble free. I also have soldered bigger copper to smaller to make hose reducers for when Ford changes hose sizes on the ends, I really hate that crap. The Contour has a 5/8 hose for part of the run, reducer, then 3/4 rest of the way. I do the same on Focus passenger side lower rad hose to reservoir, space it at the power steering supply hose coupler and it looks factory.
I've found on Focus It's helpful to have rubber only the last 2 feet from the plastic reservoir, that allows you to unbolt reservoir and flip it upside down on top of the PS unit, it makes plenty of room around the pass motor mount for alt and cam belt changing.
This stuff takes the place of my building the race cars in the '70s, easy and allows my creative urge some outlet. Nowadays I get as much out of doing it as cheap as I can, but solid as a rock and never breaks, it takes the place of 600 HP street cars.
Last edited by amc49; 04-01-2013 at 02:35 AM.