Header Question
Thread Starter
Racer
Joined: Aug 2008
Posts: 335
Likes: 27
From: Yukon Oklahoma
Header Question
I will be doing a pulley swap in the future and I know a lot of guys still run the stock manifolds. I was considering doing ARH mid-length headers since I already have a Borla x-pipe, any issues with using mid-length headers since they are just 1 3/4?
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
I think most shops use 2 inch on the lt4. I ordered AR headers from Weapon X and they recommended 2 inch. Get them coated! IMHO!
Advanced
Joined: Apr 2018
Posts: 66
Likes: 13
From: Clements Maryland
-Jason
Thread Starter
Racer
Joined: Aug 2008
Posts: 335
Likes: 27
From: Yukon Oklahoma
Since you’re doing a pulley I would assume you’re trying to get the most power you can. Most shops/people do seem to recommend 2” long tubes. Maybe some others with more knowledge can chime in, but I think some that track their cars go with 1 7/8” due to the power delivery and/or making more power lower in the curve. Don’t quote me on that, but I believe I have read that before. However, you for sure can’t go wrong with long tube 2” or 1 7/8”. I’m going with 2” in about a month or so.
-Jason
ARH mids-Plan to do
Corsa x pipe-Already have a Borla X-pipe
E-85 sensor-Plan to do E85
Thermal spacers-No plans to do
170 degree stat-Maybe
Expansion tank-Already have
Ported blower-No plans to do
Upper pulley-Plan to do just not sure if I want to do a upper or lower.
Alky control-Don't think this is needed for a Street and occasional strip car when running a 60/40 mix of Gas/E85.
Hall tech intake-Have the BMS but considering going to a full CAI waiting on Vararam to come out with theirs.
Racer
Joined: May 2017
Posts: 418
Likes: 60
From: Reading PA
Been debating the whole header thing for a while myself and here is my .02 on it. If you are just doing basic mods like pulley, intake and tune, then headers are not necessary. The power increase (20hp) is not worth the 2k they cost. My main reason I was considering headers was the stock cats handling the extra heat from the extra couple pounds of boost if I did a pulley swap. I know there are a ton of people running intake, tune and pulley with no headers and are fine. There are plenty of shops that could probably chime in and say the same. If I was gonna go all out and go for big big power, then yeah I would do headers. But for simple bolt ons where you're picking up 50-80 hp or so, I don't see the benefit of them at all. I am completely stock right now but plan on doing an intake, 10% lower and tune soon. I decided definitely not going to be doing headers.
Thread Starter
Racer
Joined: Aug 2008
Posts: 335
Likes: 27
From: Yukon Oklahoma
The only reason was I have a Borla X-Pipe already and the Mid-Lengths would bolt right up to it, if I went full long tubes I would have to remove the Borla X-pipe and sell it which probably wouldn't be a problem, but I like it. Also the ARH Mid's don't require a tune so I could run them until I did the pulley and E85 then tune.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Been debating the whole header thing for a while myself and here is my .02 on it. If you are just doing basic mods like pulley, intake and tune, then headers are not necessary. The power increase (20hp) is not worth the 2k they cost. My main reason I was considering headers was the stock cats handling the extra heat from the extra couple pounds of boost if I did a pulley swap. I know there are a ton of people running intake, tune and pulley with no headers and are fine. There are plenty of shops that could probably chime in and say the same. If I was gonna go all out and go for big big power, then yeah I would do headers. But for simple bolt ons where you're picking up 50-80 hp or so, I don't see the benefit of them at all. I am completely stock right now but plan on doing an intake, 10% lower and tune soon. I decided definitely not going to be doing headers.
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Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Drifting
Joined: Aug 2002
Posts: 1,538
Likes: 290
From: Central MO
Below is a list of mods from another forum member his car made 700/700, he has ARH Mid-Length's and I believe they are catted. Granted I don't think I'll be doing all the mods he has so I won't be making the same power, my main concern was how much horsepower the 1 3/4 Mid-Length Headers would support and judging from his build and results I should have no worries with a proper tune which is the key. I already have a Borla X-Pipe, Mamo PTB, and BMS filter.
ARH mids-Plan to do
Corsa x pipe-Already have a Borla X-pipe
E-85 sensor-Plan to do E85
Thermal spacers-No plans to do
170 degree stat-Maybe
Expansion tank-Already have
Ported blower-No plans to do
Upper pulley-Plan to do just not sure if I want to do a upper or lower.
Alky control-Don't think this is needed for a Street and occasional strip car when running a 60/40 mix of Gas/E85.
Hall tech intake-Have the BMS but considering going to a full CAI waiting on Vararam to come out with theirs.
ARH mids-Plan to do
Corsa x pipe-Already have a Borla X-pipe
E-85 sensor-Plan to do E85
Thermal spacers-No plans to do
170 degree stat-Maybe
Expansion tank-Already have
Ported blower-No plans to do
Upper pulley-Plan to do just not sure if I want to do a upper or lower.
Alky control-Don't think this is needed for a Street and occasional strip car when running a 60/40 mix of Gas/E85.
Hall tech intake-Have the BMS but considering going to a full CAI waiting on Vararam to come out with theirs.
Cordes Performance (CPR) and NicD did an amazing job with the instal and tuning. Not sure if you have a local shop you are dealing with but Phoenix is not a far drive and if you coordinate with them all that should be able to be done in a week. Nice vacation to the Grand Canyon state.
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
GM's tune needed to be EPA compliant. Not only for emissions in the toughest states and countries, but fuel economy thresholds as well. You don't think GM could have picked up 30 or 100 horsepower, if they didn't need to meet those goals?
Last edited by Warp Factor; Aug 17, 2018 at 02:46 PM.
Thread Starter
Racer
Joined: Aug 2008
Posts: 335
Likes: 27
From: Yukon Oklahoma
I have a very similar set up to your plans. Halltech CAI, Katech TB, E-85, Alkycontrol Meth kit, 2017 SC lid, ARH 1 7/8ths, upper (CPR) and lower pulley, Low side fuel pump (CPR), expansion tank, and CPRs larger HX, and a tune for it all. Full go, it made 675/725 in the 100 degree heat at mild elevation. (1800ft). Not sure what it does now with lower elevation and cooler air.
Cordes Performance (CPR) and NicD did an amazing job with the instal and tuning. Not sure if you have a local shop you are dealing with but Phoenix is not a far drive and if you coordinate with them all that should be able to be done in a week. Nice vacation to the Grand Canyon state.
Cordes Performance (CPR) and NicD did an amazing job with the instal and tuning. Not sure if you have a local shop you are dealing with but Phoenix is not a far drive and if you coordinate with them all that should be able to be done in a week. Nice vacation to the Grand Canyon state.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Thinking that!
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
So you still don't know! 1. No one pays 500-700 for tune on a bone stock car 2. you do not get 30 -100 on a tune with no changes 3. and yes I know for more than you about mods and the cars. 4.Your is stock and the last engine you touched had a carburetor.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
Did we remove the emission equiptment? NO! You have no idea! Plus when I did get it checked they did a sniffer test only and yes it passed!
Last edited by 3 Z06ZR1; Aug 17, 2018 at 03:32 PM.
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
GM. Ford, and Chrysler are quite capable of building 1000+ horsepower engines, when the government and warranty handcuffs are taken off. Heck, GM was producing 1000 horsepower engines way back in 1937.
Last edited by Warp Factor; Aug 17, 2018 at 04:30 PM.
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
I have a 16Z m7, I’m running Kook 17/8 with AFE, 15% lower, expansion tank and tuned. On 91 making 631/690. I’m going to drop to my 5% lower when my 2300 is installed. My 2300 is sitting on my work bench waiting for some cooler temps to install. Never had any issues with kooks or ARH there great pieces.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
I have a 16Z m7, I’m running Kook 17/8 with AFE, 15% lower, expansion tank and tuned. On 91 making 631/690. I’m going to drop to my 5% lower when my 2300 is installed. My 2300 is sitting on my work bench waiting for some cooler temps to install. Never had any issues with kooks or ARH there great pieces.
Last edited by 3 Z06ZR1; Aug 17, 2018 at 06:30 PM.