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Old 04-07-2015, 02:05 AM   #1
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Weight loss via Full Length Exhaust?

Anyone know the potential weight savings from replacing the full exhaust from the headers back?

I'd prefer to run high-flow cats rather than catless.

Also interested in recommendations for headers, mid-pipes, cat back, etc.

My only goal is weight, not power or sound -- so if any of the OEM parts are lighter, then I'd prefer to keep them but I imagine thats not the case.

Thanks
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Old 04-07-2015, 06:26 AM   #2
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you mentioned in a previous post about not wanting to lose warranty. You can't run headers without a tune to get rid of the check engine light and you won't be smog legal in Cali. Not sure if that matters or not.
You'll probably save 20-25 pounds. Is that worth over 2k?
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Old 04-07-2015, 06:47 AM   #3
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you mentioned in a previous post about not wanting to lose warranty. You can't run headers without a tune to get rid of the check engine light and you won't be smog legal in Cali. Not sure if that matters or not.
You'll probably save 20-25 pounds. Is that worth over 2k?
He wouldn't lose his warranty over changing the exhaust. The only potential warranty he would lose is if they found that his modifications contributed to the warranty claim.
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Old 04-07-2015, 10:23 AM   #4
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I wish I would have weighed stuff, I put on Kooks (catless) and couldnt believe the weight diff just holding one in each hand. I still have the manafold with cats in garage I could weigh
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Old 04-07-2015, 10:58 AM   #5
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Quite sure there's a weight loss thread posted on this site. Search for it.
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Old 04-07-2015, 04:58 PM   #6
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Originally Posted by Redlineviper View Post
He wouldn't lose his warranty over changing the exhaust. The only potential warranty he would lose is if they found that his modifications contributed to the warranty claim.
If you read my post again I said if he runs headers and wants to get rid of the check engine light he'll need to tune. If he tunes the warranty is gone.
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Old 04-07-2015, 06:02 PM   #7
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Originally Posted by Chrispy View Post
you mentioned in a previous post about not wanting to lose warranty. You can't run headers without a tune to get rid of the check engine light and you won't be smog legal in Cali. Not sure if that matters or not.
You'll probably save 20-25 pounds. Is that worth over 2k?
Good call. I do care about warranty. I also care about weight. I guess it depends on weight the savings once I've developed the trust for the engine.

I think its more than 20-25 lbs for the whole exhaust end to end.
I'm thinking more like 40-50 + ? But thats my gut feeling -- I'm hoping someone has real data.
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Old 04-07-2015, 06:10 PM   #8
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Quite sure there's a weight loss thread posted on this site. Search for it.
I did search and couldn't find anything useful.

I found this: Weight reduction list... But nothing specific on exhaust except for Post 104 which implies 275 can be lost from exhaust, wheels and tires but I don't know how much of that is exhaust.

Thanks
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Old 04-07-2015, 06:47 PM   #9
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Do you always have to do a tune with headers? Is there a reason why? What if you have cats and maintain the O2 sensors, still require a tune?
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Old 04-07-2015, 08:07 PM   #10
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Not exactly what you asked for, but from the weight reduction thread: "Headers/X/Dumps at axle for weight (-60 pounds)"
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Old 04-07-2015, 08:50 PM   #11
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Per the blue angel thread factory manifolds with cats weigh 23lbs each, bassani headers and cats weigh 17 each, but this was off an LS3.
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Old 04-07-2015, 09:31 PM   #12
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Do you always have to do a tune with headers? Is there a reason why? What if you have cats and maintain the O2 sensors, still require a tune?
Yes, the system is sensitive to cat location. With long tubes they are moved further downstream and reach operating temp slower, throwing cel's. For whatever reason even high flow cats in the stock location are throwing cel's.
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Old 04-08-2015, 03:41 AM   #13
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Yes, the system is sensitive to cat location. With long tubes they are moved further downstream and reach operating temp slower, throwing cel's. For whatever reason even high flow cats in the stock location are throwing cel's.
Poop.
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Old 04-08-2015, 10:00 AM   #14
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You only have to tune if you want maximum hp from the headers and also if you want to get the check engine light cleared that will be displayed due to the cats. If you can live with the check engine light and not extracting all the hp that the headers can give your setup then you will not need a tune and your warranty will stay preserved.
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Old 04-08-2015, 01:04 PM   #15
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You only have to tune if you want maximum hp from the headers and also if you want to get the check engine light cleared that will be displayed due to the cats. If you can live with the check engine light and not extracting all the hp that the headers can give your setup then you will not need a tune and your warranty will stay preserved.
Good to know. I'm not necessarily looking for power yet, that will come a year or two into my warranty.

CEL is a deal breaker for me. If I can clear it without a tune, that would be nice.
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Old 04-08-2015, 02:27 PM   #16
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You can get a scan tool to clear the CEL when they reappear if you like.
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Old 04-08-2015, 02:28 PM   #17
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You can get a scan tool to clear the CEL when they reappear if you like.
Is it just one time, or will the CEL appear every day?
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Old 04-08-2015, 04:11 PM   #18
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Good to know. I'm not necessarily looking for power yet, that will come a year or two into my warranty.

CEL is a deal breaker for me. If I can clear it without a tune, that would be nice.
you will be amazed when you decide to modify the car what a difference it will make in the fun factor. I lived with my car for 2 years w/o moding and regularly went to our local road course but ive been racing with 850 hp and man its a blast. you wont regret it. good luck
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Old 04-08-2015, 04:49 PM   #19
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you will be amazed when you decide to modify the car what a difference it will make in the fun factor. I lived with my car for 2 years w/o moding and regularly went to our local road course but ive been racing with 850 hp and man its a blast. you wont regret it. good luck
Thanks. I wouldn't mind hitting 600 to the wheels, but thats all the power I'm interested in. My Shelby made 600rwhp and I was happy, but it was 200lbs lighter too. I want to try and shoot for dropping 200lbs. Less weight means more fun at the track for me
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Old 04-08-2015, 06:56 PM   #20
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I run with a CEL on all the time...... No big deal..... but I do get a CEL check every month by a Auto Parts Store that run free diagnostic CEL check to make sure that my O2 sensors are the only things that show a malfunction....... When I get closer to my warranty to run out then I'll get a tune....
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Old 04-08-2015, 08:39 PM   #21
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You will lose 40 pounds with a stainless works retro catback and another 30 with stainless works headers and another 10 no cats over factory hope this helps you good luck
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Old 04-08-2015, 08:41 PM   #22
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You will lose 40 pounds with a stainless works retro catback and another 30 with stainless works headers and another 10 no cats over factory hope this helps you good luck
80lbs, that sounds like more than I hoped. You're sure about these numbers?
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Old 04-09-2015, 05:04 PM   #23
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Yes I am sure giver take a couple of pounds I weighed parts manifolds factory cats and had to weighted factory exhaust cat back to ship after I sold which is 100 pounds and all the new parts come in boxes that have the weight on them to ship headers were easy to weigh high flow cats also hope this helps good luck
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Old 04-09-2015, 07:34 PM   #24
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Oh I see, the weight of all the parts is about 80lbs. But when I replace them with lighter aftermarket parts, I will be putting like 50 or 60lbs back on the car. So savings is probably like 20lbs-ish.
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Old 04-09-2015, 10:02 PM   #25
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Oh I see, the weight of all the parts is about 80lbs. But when I replace them with lighter aftermarket parts, I will be putting like 50 or 60lbs back on the car. So savings is probably like 20lbs-ish.
Not enough weight savings to be noticed over the HP increases...
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