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Straight pipes...Power?

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Old Jul 29, 2011 | 08:45 PM
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Default Straight pipes...Power?

So I recently had the local exhaust cut out the mufflers for a better sound (awsome btw) and was wondering if this would give me any increase in rwhp. my thought process was that it was increasing flow so better performance but I dont know much yet soooo? Thanks guys!

Last edited by dheide; Jul 29, 2011 at 08:56 PM.
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Old Jul 29, 2011 | 09:29 PM
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Don't know but glad you are not my neighbor...
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Old Jul 29, 2011 | 09:43 PM
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Originally Posted by dheide
So I recently had the local exhaust cut out the mufflers for a better sound (awsome btw) and was wondering if this would give me any increase in rwhp. my thought process was that it was increasing flow so better performance but I dont know much yet soooo? Thanks guys!
More than likely, you will loose power and torque...loud does not mean better... loud only means something to a certain element of our community.. headers are " tuned " to control back pressure and scavenging of the exhaust pulses.. a crossover pipe helps Pull the exhaust gases from your engine...gutting the exhaust is a negative with respect to performance,.If you are looking for noise, gutting the mufflers will do that....but don't think there is any added benefit.
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Old Jul 29, 2011 | 09:59 PM
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If they were stock mufflers then yes you will free up some restriction which will increase RWHP (Hidden HP) -

But it will not be a ton or make it a 1/2 second faster in the 1/4 etc

Thanks,Matt
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Old Jul 29, 2011 | 11:12 PM
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I *think* so. I have a cammed car with stock exhaust. I *feel* I lost HP when I switched from my SLP Loudmouth to stock exhaust. We'll see for sure when I get my DMH cutouts...
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Old Jul 30, 2011 | 12:27 AM
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Originally Posted by dheide
So I recently had the local exhaust cut out the mufflers for a better sound (awsome btw) and was wondering if this would give me any increase in rwhp. my thought process was that it was increasing flow so better performance but I dont know much yet soooo? Thanks guys!
How much did they charge you? i might do the same
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Old Jul 30, 2011 | 01:42 AM
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Originally Posted by 04 commemorative
Don't know but glad you are not my neighbor...
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Old Jul 30, 2011 | 05:15 AM
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I left the stock cats and manifolds on so its really not very loud at all below 2k but if im stepping on it its about as loud as my buddys camed z with headers and stingers....it ran me 350 so not to bad.
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Old Jul 30, 2011 | 05:26 AM
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Not sure you would gain or lose power, it's just loud. We have straight pipes on our Z (was that way when we bought it in 05) and it dyno'd at 371/360.
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Old Jul 30, 2011 | 12:26 PM
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Originally Posted by Evil-Twin
More than likely, you will loose power and torque...loud does not mean better... loud only means something to a certain element of our community.. headers are " tuned " to control back pressure and scavenging of the exhaust pulses.. a crossover pipe helps Pull the exhaust gases from your engine...gutting the exhaust is a negative with respect to performance,.If you are looking for noise, gutting the mufflers will do that....but don't think there is any added benefit.
Evi twin is correct, gutting your exhaust probably costs you torque.
I learned this years ago drag racing my 55 chevy gasser. i had fenderwell headers and very short collectors. the car wasn't making much power on the big end. After making a pass a racer came over to me and advised me to put some tapered extensions on the headers and see how it performed. He turned out to be right as I picked up a halfe second off the E.T. I guess he knew what he was talking about.
P.S. His name was Don Garletts!
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Old Jul 30, 2011 | 03:02 PM
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Originally Posted by C5Wolfe
Evi twin is correct, gutting your exhaust probably costs you torque.
I learned this years ago drag racing my 55 chevy gasser. i had fenderwell headers and very short collectors. the car wasn't making much power on the big end. After making a pass a racer came over to me and advised me to put some tapered extensions on the headers and see how it performed. He turned out to be right as I picked up a halfe second off the E.T. I guess he knew what he was talking about.
P.S. His name was Don Garletts!
the tapered extensions caused the exhaust gas to speed up and exit faster. bournelli effect. gas slows down the farther it goes down an equal diameter tube causing the engine to work harder to push the gas out. at least if engine follows the laws of physics thats how it works anyway.
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Old Jul 30, 2011 | 03:35 PM
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Sounds REDNECK to me! What other highend sports cars have you seen like this? Maybe a "Dukes of Hazzard" horn should go w/ the stright pipes.

Last edited by dougbfresh; Jul 30, 2011 at 06:16 PM.
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Old Jul 30, 2011 | 06:12 PM
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evil-twin and c5wolfe are correct, anyone thinking straight pipes on a non drag/track car is dreaming and misinformed..don't believe just ask a tuner or reputable shop...loud just makes all those who drive vettes look bad..put mufflers back on and give you neighbors a break and not annoy the police.
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Old Jul 30, 2011 | 08:15 PM
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Thanks for the help and opinions guys! And I agree about the straight pipes being a little redneck ...not what im looking for but I only got so much coin so a mans Gota do what a mans Gota do!
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Old Jul 30, 2011 | 08:44 PM
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Originally Posted by dheide
Thanks for the help and opinions guys! And I agree about the straight pipes being a little redneck ...not what im looking for but I only got so much coin so a mans Gota do what a mans Gota do!
Why would anyone sacrafice performance for noise???? Its like some of the new breed ricers that bought into a C5. You know the ones that only want it to lope or sound good and could care less about the performance.,.,you know a low LSA number. What has my precious C5 neighborhood turned into??? IM so sad
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Old Jul 30, 2011 | 08:52 PM
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Originally Posted by 04 commemorative
Don't know but glad you are not my neighbor...
My neighbors probably hate me... long tubes to borla straights
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Old Jul 30, 2011 | 11:10 PM
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I'll agree with Evil-Twin on this - most likely you'll lose power. Besides, I wouldn't like having a car that is all that noisy.
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To Straight pipes...Power?

Old Jul 31, 2011 | 04:15 AM
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Originally Posted by dougbfresh
Sounds REDNECK to me! What other highend sports cars have you seen like this? Maybe a "Dukes of Hazzard" horn should go w/ the stright pipes.
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Old Jul 31, 2011 | 06:39 AM
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Redneck for sure!!!
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Old Jul 31, 2011 | 06:43 AM
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Geez... Just get some cut-outs. We've seen actual gains on cut-outs after the header collectors. And at least you can close them so your neighbors don't quarter you.

We don't have any loud cars in my neighborhood, thankfully. But if we did, I'm sure the neighbors here would bleach their lawn.
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