When I upgrade my KO3 to a KO4 will I be able to use the hoses and everything that was on my KO3 or am I going to have to purchase new hosing. I have owned my a4 for 2 weeks and already had a hit and run, the damage isn't bad but damn it sucks!

 

Buy some generic silicone vacuum hose (mostly 3.5mm on these cars) because you're going to find hose in pretty bad condition. But other than that, no problem.

Do the N249 bypass, also.

 

You can use all the same hoses. If they are cracked then you will want to buy new hose.