Kooks Mid Hearder size? - Pontiac G8 Forum: G8 Forums - G8Board.com
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #1 of 19 (permalink) Old 06-18-2017, 01:21 AM Thread Starter
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Kooks Mid Hearder size?

I want to install 1 7/8" X 3" MID-LENGTH HEADERS, CATTED. There is also 1 3/4"X3". Will be installing onto the OEM pipe connection. Should I get the 1 3/4" or 1 7/8"? The only other exhaust mod I have done is Magnaflow axle backs. I'm new to exhaust mods, sorry!

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post #2 of 19 (permalink) Old 06-18-2017, 03:39 AM
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Without other HP mods 1.75 will be fine.

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post #3 of 19 (permalink) Old 06-18-2017, 05:07 AM
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^^^^^^ what he says. 1 3/4 are fine.

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post #4 of 19 (permalink) Old 06-18-2017, 11:30 AM
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I thought they stopped making the 1 3/4 in mid-length? I had 1/7/8 and the only other mods I had was a Vararam intake and tune. It ran great.
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post #5 of 19 (permalink) Old 06-18-2017, 01:35 PM Thread Starter
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So with the VCM cai, Magnafow axle backs and a good tune (not superchips), I would be better using the 1 7/8 to be better equipped for other future mods??
And would it be a little more deep toned?

09, G8 GT
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VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #6 of 19 (permalink) Old 06-18-2017, 02:22 PM
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We're talking 1/8 inch here, doubt it will matter.
Knowing how Kooks production goes, get whatever is in stock

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post #7 of 19 (permalink) Old 06-18-2017, 06:58 PM
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Quote:
Originally Posted by tchr49 View Post
We're talking 1/8 inch here, doubt it will matter.
Knowing how Kooks production goes, get whatever is in stock
That 1/8 th. of an inch does make a difference. Why do you think Kooks and other header companies have 1 3/4, 1 7/8, stepped headers and so on?

Last edited by IZRED; 06-18-2017 at 07:18 PM.
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post #8 of 19 (permalink) Old 06-18-2017, 07:03 PM
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Quote:
Originally Posted by dave2009 View Post
So with the VCM cai, Magnafow axle backs and a good tune (not superchips), I would be better using the 1 7/8 to be better equipped for other future mods??
And would it be a little more deep toned?
If you're going to cam it later down the road, get the 1 7/8. If you're just going to do simple bolt-ons, you can still get 1 7/8, but 1 3/4 will be fine.
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post #9 of 19 (permalink) Old 06-19-2017, 09:14 AM
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Either size will work, but I'd suggest to get the 1 7/8". No one ever regretted getting the 1 7/8" over the 1 3/4", but I bet a few have regretted getting the 1 3/4" instead of the 1 7/8". Might as well future proof your car, just in case. 😉
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post #10 of 19 (permalink) Old 06-21-2017, 02:32 AM Thread Starter
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I agree, I think I will get 1 7/8". It only a $10 difference. I was only asking if there was any reason not to.

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VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #11 of 19 (permalink) Old 06-21-2017, 02:41 AM Thread Starter
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I have superchips F5 that does not have a setting for headers. So do I need a complete new tune and get rid of superchips?

09, G8 GT
Premium and Sport Pkgs

VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #12 of 19 (permalink) Old 06-21-2017, 09:24 AM
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how much difference does that 1/8 of an inch make? i'm asking cause I really have no idea. Like at what power levels does that little difference become relevant?

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post #13 of 19 (permalink) Old 06-21-2017, 01:28 PM
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Quote:
Originally Posted by camopaint0707 View Post
how much difference does that 1/8 of an inch make? i'm asking cause I really have no idea. Like at what power levels does that little difference become relevant?
As goes for power between the two, not much of a difference. Maybe someone else can explain it better. From what I know, it's all about the breathing. That's why IMO I think he should get 1 7/8 over 1 3/4. So later down the road if he chooses to cam it and so on. Now, 2 inch headers would be too much for a stock or simple bolt-on car. Header size has to be equivalent to power output. There's a chart out there, I just can't remember. There's also a chart for exhaust size to power output. Someone help me out if I'm wrong.
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post #14 of 19 (permalink) Old 06-22-2017, 07:27 AM
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Quote:
Originally Posted by dave2009 View Post
I have superchips F5 that does not have a setting for headers. So do I need a complete new tune and get rid of superchips?

Yes. You'll need to ditch the superchips and get a custom tune once he headers are installed.

Terry Scott
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Roto-Fab Intake with Amsoil Dry Filter / HSRK / Kooks 1-7/8 Mids / SOLO Mach Shorty (Unbalanced) Catback / Pat G Tune / Norris Motorsports Gen2 Catch Can / BMR Swaybars / BMR Rear Trailing Arms / Tein S-Tech Springs / Koni Shocks & Struts / Whiteline Rear Cradle Bushings / Whiteline Strut Bushings /

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post #15 of 19 (permalink) Old 07-03-2017, 01:45 AM Thread Starter
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To get a good tune including the transmission is approx $500 to $600?

09, G8 GT
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VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #16 of 19 (permalink) Old 07-04-2017, 01:30 PM
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Quote:
Originally Posted by dave2009 View Post
To get a good tune including the transmission is approx $500 to $600?
That's kinda steep. I got mine tuned @ EPS for $300, including the transmission {$210-tune and $90-transmission}.
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post #17 of 19 (permalink) Old 07-04-2017, 01:53 PM
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With the Stock Cam and Midpipe, the difference the 1/8" will make will be 5 HP or less. The restriction between the mid muffler and bullet mufflers and the restricted flange at the mufflers. Now you cam it big and do a full exhaust. Then you can measure the difference the larger headers can make.
So if you plan big future mods. 1 7/8 makes sense.

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post #18 of 19 (permalink) Old 07-05-2017, 02:37 PM
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Is there a fitment issue? My 1-3/4" mids fit great but I thought I read somewhere that the 1-7/8" ones were either too close to the plug wires or touched the plug wires.
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post #19 of 19 (permalink) Old 07-06-2017, 12:58 AM
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Originally Posted by FastKat View Post
Is there a fitment issue? My 1-3/4" mids fit great but I thought I read somewhere that the 1-7/8" ones were either too close to the plug wires or touched the plug wires.
It is snugged up against the front passenger plug wire a little {mine anyways}. I thought I was going to have to get some insulators. But it didn't give me no problems as goes for burning through the plug wire {mine weren't coated either}.
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