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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 12-04-2010, 10:15 PM   #1
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Exhaust question

I am trying to avoid getting a tune on my car so i can keep my warranty so i have been thinking about high flow catted mid pipes. Will i throw a CEL if i have catted longtubes? also if i dont tune the long tubes or mid pipes will my car start running lean?
Thanks for the help
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Old 12-04-2010, 11:00 PM   #2
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I am trying to avoid getting a tune on my car so i can keep my warranty so i have been thinking about high flow catted mid pipes. Will i throw a CEL if i have catted longtubes? also if i dont tune the long tubes or mid pipes will my car start running lean?
Thanks for the help
yes long tubes with or withouts cats will throw a code... when you get long tubes you should get a tune... people say running long tubes with out a tune doesn't make the car run lean. but you will have a check engine light on

simple terms you get long tubes go all the way with a CAI and a tune, dont wanna tune... stick with cat back and CAI
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Old 12-04-2010, 11:10 PM   #3
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yes long tubes with or withouts cats will throw a code... when you get long tubes you should get a tune... people say running long tubes with out a tune doesn't make the car run lean. but you will have a check engine light on

simple terms you get long tubes go all the way with a CAI and a tune, dont wanna tune... stick with cat back and CAI
A tune is out of the question i am not voiding my warranty. and i have been watching some sound clips of mid pipes and like the way it sounds and people are seein 20wheel untuned which is a nice gain for not a bad price IMO
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Old 12-04-2010, 11:11 PM   #4
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yes long tubes with or withouts cats will throw a code... when you get long tubes you should get a tune... people say running long tubes with out a tune doesn't make the car run lean. but you will have a check engine light on

simple terms you get long tubes go all the way with a CAI and a tune, dont wanna tune... stick with cat back and CAI
Long tubes will throw a code but its from the rear O2 reading wrong. The rear sensor does not adjust air/fuel. I have long tubes, CAI, and muffler delete and have been running it for a while with no problems. Or you can listen to people like mikeSS and spend your mom and dads money like it aint nothin, but if you are trying to stay on somewhat of a budget, IT IS OK to run long tubes without a tune.
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Old 12-04-2010, 11:14 PM   #5
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My last car was running rich with LT's. I would not even put LT's on your car if you are not getting a tune.

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Old 12-04-2010, 11:19 PM   #6
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thanks for the input i think mid pipes are going to be my answer. for the sound and power can really beat the price. any thoughts on jba vs SOLO
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Old 12-04-2010, 11:59 PM   #7
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thanks for the input i think mid pipes are going to be my answer. for the sound and power can really beat the price. any thoughts on jba vs SOLO
It was my understanding if you use adapters to get those rear O2 sensors out of the direct exhaust stream no codes are thrown, even without a tune. Do I have this wrong?
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Old 12-05-2010, 01:09 AM   #8
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It was my understanding if you use adapters to get those rear O2 sensors out of the direct exhaust stream no codes are thrown, even without a tune. Do I have this wrong?
ive been reading with the high flow catted mid pipes there is a chance to get a code but most likely wont because there is still a cat there
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Old 12-05-2010, 07:28 AM   #9
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From all the reading on C5, my plan is to do CAI and cat back so I keep the warranty. When the warranty is about to run out, plan for the LTs and tune. It should be like getting a new Camaro 3 years later.
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Old 12-05-2010, 10:48 AM   #10
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From all the reading on C5, my plan is to do CAI and cat back so I keep the warranty. When the warranty is about to run out, plan for the LTs and tune. It should be like getting a new Camaro 3 years later.
powertrain is 5yrs 100k miles an im worried about losing the warranty on my motor, trans etc so thats why i like the no tune factor of the mid pipes
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Old 12-05-2010, 11:46 AM   #11
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Do you have a dealer that is threatening you if u get a tune? Ur best bet would be to buy a tuner from say Jannetty and do mail order tunes, this way u can keep ur own factory tune and can reinstall anytime u may need to take it to the dealer.

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Old 12-05-2010, 12:31 PM   #12
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Do you have a dealer that is threatening you if u get a tune? Ur best bet would be to buy a tuner from say Jannetty and do mail order tunes, this way u can keep ur own factory tune and can reinstall anytime u may need to take it to the dealer.

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No i dont but if say anything did happen i dont want that to be the issue, but i have read on here that they can read if you have uploaded a tune even if you put it back to stock.
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Old 12-05-2010, 12:44 PM   #13
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From all the reading on C5, my plan is to do CAI and cat back so I keep the warranty. When the warranty is about to run out, plan for the LTs and tune. It should be like getting a new Camaro 3 years later.
Plan on waiting 5 years. The Camaro has a 5 year, 100,000 mile powertrain warranty. That's one of biggest issues making it so hard for guys to make the decision (to mod or not to mod).

Lots of the "keep your warranty" guys from 12 months ago and now modded and tuned. Modding is like a drug. It can be hard to resist the temptation.
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Old 12-05-2010, 02:00 PM   #14
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Plan on waiting 5 years. The Camaro has a 5 year, 100,000 mile powertrain warranty. That's one of biggest issues making it so hard for guys to make the decision (to mod or not to mod).

Lots of the "keep your warranty" guys from 12 months ago and now modded and tuned. Modding is like a drug. It can be hard to resist the temptation.
this is so true
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Old 12-15-2010, 09:18 PM   #15
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Long tubes will throw a code but its from the rear O2 reading wrong. The rear sensor does not adjust air/fuel. I have long tubes, CAI, and muffler delete and have been running it for a while with no problems. Or you can listen to people like mikeSS and spend your mom and dads money like it aint nothin, but if you are trying to stay on somewhat of a budget, IT IS OK to run long tubes without a tune.
I'm not being a smarta** by any means.. but why are you the only one saying you don't need a tune after LT headers? I really don't know either way which is right, I'm honestly asking? Why do they say yes and you say no?
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Old 12-15-2010, 09:41 PM   #16
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I'm not being a smarta** by any means.. but why are you the only one saying you don't need a tune after LT headers? I really don't know either way which is right, I'm honestly asking? Why do they say yes and you say no?
to get rid of the cel yes you NEED a tune, if youre untuned with longtubes your car will not get the maximum horsepower out of the headers also "they say" running untuned with longtubes will create you car to run lean over time, which is not good for your motor.
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Old 12-15-2010, 09:58 PM   #17
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I have not heard of anyone that has longtubes and has not had their check engine light come on. Mine came on immediately (with Kooks) but others have said it took much longer. The whole point of the tune is not only to harness the torque and horsepower you can gain from LT's, and of course to calibrate your engine to the new headers. Maybe some professional tuners can chime in on the dangers of not tuning.

Also, when you get your car on the dyno and then tuned, they do not only alter things that have to do with the headers. My tuner did so much with the transmission and torque management that it feels like a completely different car. So when you think about getting a tune, realize that it is doing much for the car then turning the check engine light off and gaining power from the headers. It is a damn good investment.
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Old 12-15-2010, 10:01 PM   #18
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I have not heard of anyone that has longtubes and has not had their check engine light come on. Mine came on immediately (with Kooks) but others have said it took much longer. The whole point of the tune is not only to harness the torque and horsepower you can gain from LT's, and of course to calibrate your engine to the new headers. Maybe some professional tuners can chime in on the dangers of not tuning.

Also, when you get your car on the dyno and then tuned, they do not only alter things that have to do with the headers. My tuner did so much with the transmission and torque management that it feels like a completely different car. So when you think about getting a tune, realize that it is doing much for the car then turning the check engine light off and gaining power from the headers. It is a damn good investment.
Trust me I want all of this more than anything but I also want to keep my warranty too. but then again, what really will break or go wrong??
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Old 12-15-2010, 10:32 PM   #19
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Trust me I want all of this more than anything but I also want to keep my warranty too. but then again, what really will break or go wrong??
I am in the same boat i really really want long tubes and a tune but its not what this will cause to go wrong, cars have a mind of their own IMO and stuff sometimes just happens and if whatever that may be mechanical I dont want to be stuck with the bill.
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Old 12-15-2010, 11:27 PM   #20
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I am in the same boat i really really want long tubes and a tune but its not what this will cause to go wrong, cars have a mind of their own IMO and stuff sometimes just happens and if whatever that may be mechanical I dont want to be stuck with the bill.
If your warranty is you man concern, stick to appearance mods.

If you only want a little risk add a CAI and a cat-back. CAI adds a few HP, Cat-back = nothing.

LTs and high flow cats add more risk and more HP.

With LTs rear O2 extenders help prevent codes without tuning out the rear O2s.

Tune even more warranty risk.

Cam - forget about it.

But I think most would here recommend a tune with LTs.
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Old 12-16-2010, 08:57 AM   #21
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Dude if you want long tubes get them. Talk to Highcompression. He did his about 3 months ago and so far he has not thrown a CEL code. He used 2" O2 Extenders to off set the rear O2 sensors and trick the computer into thinking the reading is different.

Basically the code is because the rear O2 is reading the same as the Front one. By buying the extender you move the sensor out of the direct path of the exhaust and therby tricking it because it gets a defferent reading then the front one and No Code.
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Old 12-16-2010, 09:14 AM   #22
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Dude if you want long tubes get them. Talk to Highcompression. He did his about 3 months ago and so far he has not thrown a CEL code. He used 2" O2 Extenders to off set the rear O2 sensors and trick the computer into thinking the reading is different.

Basically the code is because the rear O2 is reading the same as the Front one. By buying the extender you move the sensor out of the direct path of the exhaust and therby tricking it because it gets a defferent reading then the front one and No Code.


This is my understanding as well. I swear I read a post by one of the vendor/tuners on here that said LT's do not cause the engine to run lean or rich.......I could be wrong, but almost positive I seen this. Also, I believe member "Highcompression" has been running LT's with NO tune for some time now, with no code as mentioned above by CamaroCowboy.

I was in the same boat as the OP regarding the warranty and getting a tune, but I can't take it any longer... So I'm getting LT's and a tune this spring. I believe these motors were built to run free, with no issues.

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Old 12-16-2010, 12:53 PM   #23
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to the above posts i read hicompressions install thread and he has antifoulers on the plugs and i was thinking about that but until i get word from a trust worthy tuning specialist that lt's with no tune wont harm the motor im not going to do it.
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