The new o2 housing provides maximum flow for your Nline/K5 GT 2.5T 4in o2 housing that tapers to 3in seamlessly for a smooth transition. Available with legal high flow cat for on-road use and a catless version for offroad use only. If purchasing the offroad version, you are agreeing to use it for offroad use only. JB4 or equivalent device reccomended to get the most out of this modification and to keep the car safe.  Unfortunately the cat for this unit needs to be EPA compliant so there is a price tag attached to epa approved cats. This unit will be using the GESI G-Sport GEN2 cat for all of our high flow orders. Good for 350-500hp
 
*NOTE (THE ABOVE PICTURE SHOWS THE O2 HOUSING AND DOWNPIPE TOGETHER. THE DOWNPIPE CONTAINS THE FLEX SECTION WHILE THE O2 HOUSING HAS THE O2 SENSOR BUNGS. PLEASE BE AWARE BEFORE ORDERING THIS IS THE O2 HOUSING AND DOES NOT INCLUDE THE DOWNPIPE. DOWN PIPE SOLD SEPARATELY)