1 7/8 Headers Under $300
Race Director
Joined: Dec 2013
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Safety Car
Joined: May 2011
Posts: 3,807
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From: Oshawa, Ontario
not likely
OBX are a great fitting header with beautiful welds and excellent overall quality that make the same power as any header out there.dont hold your breath waiting to find them anytime soon selling for $278.
Le Mans Master
Joined: May 2015
Posts: 5,187
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From: Las Vegas Nevada
The only similar listing I found wasn't headers...they are just x-pipes and connections. Here is the listing...from houston, similar price...
http://www.ebay.com/itm/Stainless-St...dWqpg~&vxp=mtr
http://www.ebay.com/itm/Stainless-St...dWqpg~&vxp=mtr
Last edited by buckmeister2; May 24, 2016 at 12:11 AM.
Race Director
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Hence the high flow cats only rob you about 3hp, but keeps the car from reeking of un-burnt gas at every stop light instead.
On the postive note, if you got the X pipe with resonators, you can pull the resonator sections to add in high flow cats isntead.
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From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
Melting Slicks
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From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
Not sure if I will get in trouble for posting this link but here it is. If not allowed then I will remove it. Don't want to cause hard feelings with vendors.
http://www.ebay.com/itm/111784931655?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.com/itm/111784931655?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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Racer
Joined: Jun 2014
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The exact seller I was talking about is temporarily out of stock. I have the listing saved in my eBay so I can still see it but a current search for the item won't turn up his listing. I messaged him to see if he will be getting more but haven't received a response yet.
Race Director
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FYI, on a stock LS-2 and LS-3, your giving up Lower end power with a 1 7/8" ID header.
You want 1 3/4" ID headers for these two oem motors, which gives a better Bernoulli effect at the lower engine RPM's, yet flow fine for max RPM's as well. Hence bigger ID headers are not better if too large for the motor, since the larger ID takes more exhaust volume to build up the needed gas speed to create the Bernoulli effect/ vacuum effect of the collector to draw out the gasses in the header tube.
So a good header design and piping ID size is get the header to Bernoulli effect at the lowest speed possible, but not to create a volume block point with too small of piping at top RPM's instead.
You want 1 3/4" ID headers for these two oem motors, which gives a better Bernoulli effect at the lower engine RPM's, yet flow fine for max RPM's as well. Hence bigger ID headers are not better if too large for the motor, since the larger ID takes more exhaust volume to build up the needed gas speed to create the Bernoulli effect/ vacuum effect of the collector to draw out the gasses in the header tube.
So a good header design and piping ID size is get the header to Bernoulli effect at the lowest speed possible, but not to create a volume block point with too small of piping at top RPM's instead.
Thread Starter
Racer
Joined: Jun 2014
Posts: 278
Likes: 17
Very well covered topic. Tons of dyno comparisons on the internet. Going to be very small differences in the tq at low rpm. However probably 75% of members that add an ORH will not stop with the mods there.
Safety Car
Joined: May 2011
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From: Oshawa, Ontario
Le Mans Master
Joined: Oct 2012
Posts: 8,434
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From: Texas
FYI, on a stock LS-2 and LS-3, your giving up Lower end power with a 1 7/8" ID header.
You want 1 3/4" ID headers for these two oem motors, which gives a better Bernoulli effect at the lower engine RPM's, yet flow fine for max RPM's as well. Hence bigger ID headers are not better if too large for the motor, since the larger ID takes more exhaust volume to build up the needed gas speed to create the Bernoulli effect/ vacuum effect of the collector to draw out the gasses in the header tube.
So a good header design and piping ID size is get the header to Bernoulli effect at the lowest speed possible, but not to create a volume block point with too small of piping at top RPM's instead.
https://youtu.be/NekTRPx68zs
You want 1 3/4" ID headers for these two oem motors, which gives a better Bernoulli effect at the lower engine RPM's, yet flow fine for max RPM's as well. Hence bigger ID headers are not better if too large for the motor, since the larger ID takes more exhaust volume to build up the needed gas speed to create the Bernoulli effect/ vacuum effect of the collector to draw out the gasses in the header tube.
So a good header design and piping ID size is get the header to Bernoulli effect at the lowest speed possible, but not to create a volume block point with too small of piping at top RPM's instead.
https://youtu.be/NekTRPx68zs
Incorrect. All stock head ls2's need 1 3/4" headers where as the LS3 does better with the 1 7/8" inch headers with any level of modifications.
Safety Car
Joined: May 2011
Posts: 3,807
Likes: 508
From: Oshawa, Ontario
my stock headed LS2 with 1 7/8" OBX catted LT's made 650 rwhp.the 1 7/8" didn't seem to hinder rwhp output much
Last edited by irok; Jun 7, 2016 at 11:21 AM.