2 inch vs 1 7/8 inch header back to back test

BadBowtieProductions · 09-12-2016, 12:02 PM

Has anyone done one? I assume it would most likely be a shop. Going over to check CorvetteForum now, but figured I would post up here as well.

AndyUK · 09-12-2016, 12:05 PM

Pretty sure it was the corvette forum where a well known tuner said that 1 7/8 was best up to about 700rwhp

ULTRAZLS1 · 09-12-2016, 12:30 PM

I've heard both answers.

I do know on the ls3 2 inch was best.

Been waiting for this myself. I posted this same question and was told 15 rwhp advantage for the 2 inch per CPR.

http://www.camaro6.com/forums/showthread.php?t=464189

Let me know what you find out.

Really wish Janetty would do a nice comprehensive back to back test like they did with the ls3.

Fraxum · 09-12-2016, 12:40 PM

Quote:

Originally Posted by ULTRAZLS1

Really wish Janetty would do a nice comprehensive back to back test like they did with the ls3.

Maybe because the install is so intense. Except for maybe the Hookers. The 5th gen was a snap, probably only a couple of hours once you do it a few times.

Do we really know how much power any LT adds going through the stock exhaust?

ULTRAZLS1 · 09-12-2016, 12:47 PM

Or because they sell arh and I don't see a 2 inch offering from arh. Only kooks and sw so far. Guessing this has something to do with mixed answers from other vendors as well.

Ecchi667 · 09-12-2016, 01:14 PM

One of the shops on here said 2" was the way to go, but I forget where they commented so can't quote it for you. It would seem that bigger is better, and it'll work out even better if you go for more power in the future, too (forced induction, etc).

Ecchi667 · 09-12-2016, 01:25 PM

Found it, it was Joe at CPR (but was also referring to tests on the Corvette, unfortunately):

Quote:

Originally Posted by Joe@CPR.com

ARH is the preferred brand here, we have installed 5 now and the fit and finish is perfect. 2'' is also the better option on the new LT motors. We make C7 longtubes and during our testing tried all 3 of the popular sizes and the 2'' made more hp/tq all across the rpm band so we decided to only do a 2''.

Joe@CPR.com · 09-12-2016, 01:26 PM

Same motor, would only do a 2'' on the new lt motors

Sent from my SM-G935V using Tapatalk

Slem · 09-12-2016, 01:32 PM

On a stock motor? 1 7/8 is plenty and will support up to 700 hp and more, if you are building a motor up, tune, blower, big cam, stroked, ect. That might be better for the 2 inch headers. You might gain 10 or 15 hp and tq or even more. But on a stock motor I would stick to 1 7/8 and build up on that, what you won't see on a dyno is throttle response and that 1 7/8 will most likely give you better throttle response. Just my opinion

ULTRAZLS1 · 09-12-2016, 01:38 PM

Quote:

Originally Posted by Joe@CPR.com

Same motor, would only do a 2'' on the new lt motors

Sent from my SM-G935V using Tapatalk

Does arh make a 2 inch for the 6gen camaro? Didn't see any last time I checked...

Joe@CPR.com · 09-12-2016, 03:15 PM

Quote:

Originally Posted by ULTRAZLS1

Does arh make a 2 inch for the 6gen camaro? Didn't see any last time I checked...

yes they do, we did one of the, if not the first set made. We are arh dealers btw if you are looking to get a set.

ULTRAZLS1 · 09-12-2016, 03:33 PM

Quote:

Originally Posted by Joe@CPR.com

yes they do, we did one of the, if not the first set made. We are arh dealers btw if you are looking to get a set.

Thanks I'll keep that in mind.

BadBowtieProductions · 09-12-2016, 04:03 PM

Quote:

Originally Posted by Joe@CPR.com

yes they do, we did one of the, if not the first set made. We are arh dealers btw if you are looking to get a set.

A local guy is an ARH dealer as well, I know he cut me a nice chunk off of the retail but I wouldn't mind hearing your pricing as well if you want to shoot me a PM. 2" to mate up to the NPP.

Cdflyer · 09-12-2016, 08:30 PM

From the conversation I had with my local LS engine builder, 2" "might" give up some bottom end when naturally aspirated. Now he has yet to do anything with the LT, because let's face it there aren't many LT's getting stroked yet.

But our conversation was based on me choosing a header that I'll only have to do once. I'm picky and hate doing things two or three times. Since my plan is to eventually add a blower, we decided 2" headers would be best. Infact it might benefit from 2"+ but then you run into fitting it in the chassis.

09-12-2016, 12:02 PM	#1
BadBowtieProductions Check me out on YouTube! Drives: 2016 Camaro SS Join Date: Feb 2015 Location: STL Posts: 160	2 inch vs 1 7/8 inch header back to back test Has anyone done one? I assume it would most likely be a shop. Going over to check CorvetteForum now, but figured I would post up here as well. __________________ 2016 Camaro SS - A8, NPP, 2SS, Nightfall Gray Metallic 11.68 @ 118 - CAI Intake - TSP 2" Longtubes - DSX Tuning Flex Fuel - DSX Tuned 11.91 @ 117 - CAI intake only 11.99 @ 117 - STOCK 1/4 mile 410 RWHP / 424 RWTQ - STOCK Dyno --- YouTube Channel: BadBowtieProductions

09-12-2016, 12:05 PM	#2
AndyUK Drives: 2017 Camaro SS Join Date: Aug 2016 Location: UK Posts: 334	Pretty sure it was the corvette forum where a well known tuner said that 1 7/8 was best up to about 700rwhp

09-12-2016, 12:30 PM	#3
ULTRAZLS1 Drives: 14 Silverado LTZ Z71, 16 Camaro SS Join Date: Nov 2009 Location: Jackson, Michigan Posts: 4,407	I've heard both answers. I do know on the ls3 2 inch was best. Been waiting for this myself. I posted this same question and was told 15 rwhp advantage for the 2 inch per CPR. http://www.camaro6.com/forums/showthread.php?t=464189 Let me know what you find out. Really wish Janetty would do a nice comprehensive back to back test like they did with the ls3.

09-12-2016, 12:47 PM	#5
ULTRAZLS1 Drives: 14 Silverado LTZ Z71, 16 Camaro SS Join Date: Nov 2009 Location: Jackson, Michigan Posts: 4,407	Or because they sell arh and I don't see a 2 inch offering from arh. Only kooks and sw so far. Guessing this has something to do with mixed answers from other vendors as well.

09-12-2016, 01:14 PM	#6
Ecchi667 Drives: 2016 Camaro 2SS, 6spd M Join Date: Aug 2016 Location: Lexington, SC Posts: 326 View My Garage	One of the shops on here said 2" was the way to go, but I forget where they commented so can't quote it for you. It would seem that bigger is better, and it'll work out even better if you go for more power in the future, too (forced induction, etc).

09-12-2016, 01:26 PM	#8
Joe@CPR.com Account Suspended Drives: 03 vette, 94 trans am, 04 gto Join Date: Jul 2012 Location: Mesa, AZ Posts: 995	Same motor, would only do a 2'' on the new lt motors Sent from my SM-G935V using Tapatalk

09-12-2016, 01:32 PM	#9
Slem Drives: 2016 Summit White 2SS (Auto) Loaded Join Date: Jul 2016 Location: Ontario Posts: 487 View My Garage	On a stock motor? 1 7/8 is plenty and will support up to 700 hp and more, if you are building a motor up, tune, blower, big cam, stroked, ect. That might be better for the 2 inch headers. You might gain 10 or 15 hp and tq or even more. But on a stock motor I would stick to 1 7/8 and build up on that, what you won't see on a dyno is throttle response and that 1 7/8 will most likely give you better throttle response. Just my opinion

09-12-2016, 08:30 PM	#14
Cdflyer Drives: 2016 1SS 6speed Join Date: Mar 2016 Location: IL Posts: 527	From the conversation I had with my local LS engine builder, 2" "might" give up some bottom end when naturally aspirated. Now he has yet to do anything with the LT, because let's face it there aren't many LT's getting stroked yet. But our conversation was based on me choosing a header that I'll only have to do once. I'm picky and hate doing things two or three times. Since my plan is to eventually add a blower, we decided 2" headers would be best. Infact it might benefit from 2"+ but then you run into fitting it in the chassis.

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