On a 08 gt (same as 05-10 v8 gt) do you need 1 pair of 02 extenders or 2 pairs ?
Thank you

 

tune keeping the rear O2's on? if yes, you need 2 pairs

if tune turns off the rear O2's (most common), then you only need 1 pair

 

Turning the rear sensors off is a given usually since you have longtubes. Isnt it? With an auto trans you will need two. Manual trans only needs one.

 

New federal mandate all aftermarket tuners can not turn off rear o2's anymore. You will need 2 pairs of extension harnesses'. Now if you buy a real header kit such as American Racing they come with all the hardware including 2 pairs or extension harnesses'