I bought some R9 fuel injection line today (5/16) . They had a larger (3/8) line that had a blue plastic sleeve lining the line. I noticed the factory stuff also has this sleeve in the line. Should I try to find some of this lined injection line, or is the regular R9 safe?

 

I would think as long as it's rated for 120 psi you're safe. And anything that's high pressure fuel injection hose should be fiber reinforced. I've raced with the generic NAPA hose with zero problems.