YAYITSJEWDAY87

i just purcheased a mac cat back exhaust with h pipe question is will all 4 of my o2's still be in play or will all four of them need to be deleted and i heard about these mil eliminators do they get rid of the sensor all together or does it just make so it dont have to threaded into the exhaust whats the purpose of these???

MU71L4710N

you re use them...

mil elim just plugs in between the 2 rear 02's

LilRoush

You MUST retain the upstream pair for your car to run.

YAYITSJEWDAY87

ok so the rear ones can go to the trash then so the front o2's where are they located bc i thought the h pipe bolts directly to the headers and gets rid off all 4 cats arent they right before the front 2 cats

MU71L4710N

no...the back two DONT go in the trash i just said you re-use them. if they go in the trash its because you turned off the rear 02's with a tuner and you welded the holes shut or something.

YAYITSJEWDAY87

OK so the mil eliminators still have to plug in the o2's im not very familiar with this so the cat back exhaust system will have holes on it for all 4 o2's then correct then what is the purpose of the eliminators then