you also need to be careful which braided pipe you buy, it MUST be fuel suitable or it will leak over time, many rallycars i used to prep would come in and stink of fuel constantly and turns out pipe goes pourus when not under load, and fittings can work loose so easy

people oftern mis interprit - sizes, -8 doesnt equate to 8mm internal diamiter

-2 0.08" -2.03mm
-3 0.13" - 3.17mm
-4 0.19" - 4.83mm
-6 0.34" - 8.64mm
-8 0.56" - 14.22mm

my A4 runs -8 feed and -6 return and trust me there fcuking huge!

p.s fuel and oil hoses are 2 totaly different beasts

i.e use airline hose (350psi rated) on a fuel system and it will burst within 5 mins, i unfortunatly found this out after getting my A4 running at 3am for the first time being impatient lol

Sean