I did quick search did not see much. I'm installing a SOHN adapter and will replace the omp lines whilst i'm there. But I'm thinking of using 1/8th brass tubing, I like that old school look on old engine with these kinda of lines(fuel oil etc). what do ya'll think. I'm still open when it comes to connecting the tubing to the banjo fittings. but that won't be hard to sort out. May even place a small clear(ish) section in mid-ways to view flow. (04 model so just 4)

 

IF you have the confidence in connecting the brass lines to the banjos I'd say go for it. Don't just roll out some copper tubbing and leave it there. Do a nice job of bending and fitting them exactly as they should be and it would look kind of cool. You don't even need a clear spot it's pretty much impossible to see the fluid in stock lines. Well you can see the fluid, but that is it you don't see it flowing. The brass shouldn't hurt anything. I've used brass fittings for the sohn adaptor and tank on my car.

 

oh it will be a fine job. i'll have mounting points along the way so they don't bounce around either.

 

Yeah I have brass NPT fittings on my Sohn adapter reservoir and Sohn. They should be fine for the OMP lines, but 1/8 brass line would seem very delicate to me, so long as you don't break it handling it. You should be ok.