Header install 1 3/4" vs 1 7/8"

[OzS550]

For those who've had experience installing both 1 3/4" and 1 7/8", is there a difference with the install?

Is it easier to retain the factory header studs with 1 3/4"? Any other advantages of the smaller pipes or is it negligible?

Staying N/A and think 1 3/4" will be fine for my purposes and keen to do it myself with help and a hoist.

Cheers,

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[Brmoorejr]

I used all factory studs except 1 or 2
I used Kooks 1 7/8 headers

 

[growler]

u can use pypes stepped headers and get best of both for less money

 

[2016GTM6]

Installed pypes stepped and was able to use all factory studs

 

[SilverSurfer]

Installed stainless works over the weekend. I was able to retain all the OE studs.

 

[msweet]

Guys OP is in Australia. LHD headers don't work on RHD, so he can't use Pypes stepped headers or anything that isn't also made in RHD version (Kooks & ARH are the only US options I believe)

 

[Performance nut]

Just to interject something, my mechanic was saying headers are even less of a gain for the 2018's as the shape of the pipes is better than on the 2015-17's. Not to say there isn't gain, just not as much.

 

[MrWolf]

Just to interject something, my mechanic was saying headers are even less of a gain for the 2018's as the shape of the pipes is better than on the 2015-17's. Not to say there isn't gain, just not as much.

Except we still get the botched headers on RHD cars similar to the RHD 15-17s so changing the headers will give RHD additional benefit compared to the LHD cars

 

[Rjames18]

Just to interject something, my mechanic was saying headers are even less of a gain for the 2018's as the shape of the pipes is better than on the 2015-17's. Not to say there isn't gain, just not as much.

All they did differently is right before the cat it doesn't choke into a 2" piece. I will look again later tonight but we've compared the two headers next to each other and there wasn't much difference between the two except one spot doesn't get choked anymore

 

[OzS550]

Thanks all.

I'm thinking retaining the factory studs should be one of the goals of a good install and this looks achievable. Why doesn't everyone use the factory studs?

 

[growler]

on my install if u didn't know a stud wouldn't fit you had to pull everything back off to get it in, because the header tube was in the way, wasn't worth the effort,,,, better instructions yeah, u could use studs all the way I ended up using one or two bolts but there again every style header will be different

 

[Burkey]

Thanks all.

I'm thinking retaining the factory studs should be one of the goals of a good install and this looks achievable. Why doesn't everyone use the factory studs?

On my RHD Pacemaker headers, the front stud per bank was retained. This is purely to give you something to start with (header hole is slotted to allow it to slide under the nut)
There just isn’t enough room with these particular headers to be able to get the header “out and over” the stud so to speak. In fact, you’re flat out just trying to get the headers in there in the first place.
Drivers side is by far harder than passengers side. Steering column, starter motor and AC being the culprits.
LHD cars may face different issues.

 

[OzS550]

On my RHD Pacemaker headers, the front stud per bank was retained. This is purely to give you something to start with (header hole is slotted to allow it to slide under the nut)
There just isn’t enough room with these particular headers to be able to get the header “out and over” the stud so to speak. In fact, you’re flat out just trying to get the headers in their in the first place.
Drivers side is by far harder than passengers side. Steering column, starter motor and AC being the culprits.
LHD cars may face different issues.

Thanks Burkey, I'm thinking of using the 1 3/4" Pacemaker. I'm guessing you used 1 7/8" for your blown application. Do you think the 3mm smaller diameter pipe makes any difference to the install or general clearance? (I also need your advice on tunes. You've probably noticed me procrastinating over this for the past year or more!)

 

[Burkey]

Thanks Burkey, I'm thinking of using the 1 3/4" Pacemaker. I'm guessing you used 1 7/8" for your blown application. Do you think the 3mm smaller diameter pipe makes any difference to the install or general clearance? (I also need your advice on tunes. You've probably noticed me procrastinating over this for the past year or more!)

Honestly, I don’t think the size difference will make any change to the difficulty level.
I’ve seen sheets suggesting that the 1 3/4” are slightly better, particularly at the bottom end for NA applications but as far as Pacemaker are concerned, there’s no data available.
If there’s even the most remote chance that you’ll go FI, I’d just go with the bigger ones.
If you go with an e85 tune, I don’t think you’ll be left wanting for more bottom end pull. The difference is vast.

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