not usually..they're mostly needed when switching to longtube headers,cuz the o2 sensors have to be moved into the collector,which is farther back than the stock location with shorty headers,which is pretty close to the flange where the h-pipe meets the header
__________________ 92 lx 5.0 vert-,stock plastic airbox,stock T-5,shifter & clutch,stock 19lb injectors and fuel pump,no radio,speakers or cruise control..antenna delete(for less wind resistance)
(new)best so far 12.712 @ 105.99mph 1.752 60ft
Project:Notchback-in the works | 
O2 harness extension 
