I am attempting to put my K5L horns on my Pontiac Grand Prix GTP. I am going to split the horns up, and make mounting brackets. My question is, I am going to have 1/2" line from my tank going to the manifold. What size is needed to go from the manifold to each horn?
Do I have to stick with 1/2" or can I use 3/8" from the manifold to each horn? Will I lose volume by dropping to a 3/8" line? Or will I not notice it?
LOL 
have fun and a K5L or K5LA there is a huge difference it aggravates me when people forget the “A” and yes do 1/2 and buy mounts to be cheap you have K5’s so wtf you should know what your getting into. just the plastic 1/2 O.D. line to each bell and feed them all with 1/2 I.D. good year ruber hose