Header true dual question?
Header true dual question? I installed some longtube headers and true duals cut off just before the rearend. I have the front 2 o2 sensors in but theres no spot for the back o2's. My question is if I get o2 sims will i feel more power? Right now it has less power then it did before. Im getting my cam delivered monday, should I just wait to get the tune and forget the o2's or do i need them also.
Originally Posted by 01SSDRVR
I installed some longtube headers and true duals cut off just before the rearend. I have the front 2 o2 sensors in but theres no spot for the back o2's. My question is if I get o2 sims will i feel more power? Right now it has less power then it did before. Im getting my cam delivered monday, should I just wait to get the tune and forget the o2's or do i need them also.
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Joined: Oct 2002
Posts: 553
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From: Long Island, NY
Originally Posted by 01SSDRVR
I installed some longtube headers and true duals cut off just before the rearend. I have the front 2 o2 sensors in but theres no spot for the back o2's. My question is if I get o2 sims will i feel more power? Right now it has less power then it did before. Im getting my cam delivered monday, should I just wait to get the tune and forget the o2's or do i need them also.
Originally Posted by 01SSDRVR
I installed some longtube headers and true duals cut off just before the rearend. I have the front 2 o2 sensors in but theres no spot for the back o2's. My question is if I get o2 sims will i feel more power? Right now it has less power then it did before. Im getting my cam delivered monday, should I just wait to get the tune and forget the o2's or do i need them also.
Originally Posted by Fulton 1
My advice would be to not bother with installing rear O2 sensors even if you DO have cats. Instead just pick up a pair of O2 simms (for DTCs and emissions testing if applicable), install the cam, and get a tune. You should be looking good after that.
Originally Posted by txhorns281
When you get tuned, they will set the SES enable off for the rear O2s. So DO NOT WASTE MONEY ON SIMS. It's all included in your tune anyway. Those things aint cheap either. Money better spent elsewhere.
Originally Posted by Fulton 1
I was under the impression that an OBD-II emissions test could detect that the O2's had been disabled via tuning. Is this not correct? I know that with simms they can't tell.
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I thought if you didnt have the rear o2's in place the on board computer would make the car run in a closed loop cause its not getting a signal. Its also running extremy rich like the comp is overcompensating for the rear o2's not being there, so it wont burn the motor up. Am I mistaken? I know its losing power i can feel the difference, It had more power with my stock center mount exhaust 
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Teching In
Joined: Jul 2004
Posts: 9
Likes: 0
From: San Angelo, TX
from what I experienced getting mine inspected. I don't have cats and I passed the test simply because I had the codes deleted from the computer. If the codes aren't there to be thrown in the first place, then no harm or failure.