Your 1 7/8 headers may be overkill
TECH Enthusiast
Joined: Mar 2005
Posts: 663
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From: South Carolina
I can respect that from an rpm standpoint but you also are that wot at low rpm’s around town either so low end power on a dyno isn’t going to correlate to part throttle in town driving either. I bet seat of the pants no one would notice the difference in power.
Last edited by 1bdbrd; Jan 30, 2022 at 10:05 AM.
I'd rather have the bigger headers and not need them than vice versa. Unless you have the exact engine size and combo the results are irrelevant to anything else period. Apples to oranges.
TECH Apprentice
Joined: Jan 2017
Posts: 333
Likes: 75
From: Sydney, Australia
For part throttle, I guess you're unlikely to require full flow of any performance header but I don't actually know how various headers over there respond low down for that reason. I should mention that I don't even have 1 3/4 headers on my car, I have special design 1 5/8 shorties
However, I would use full throttle occasionally in that daily use but there's just no room to really wind the car out, through the gears to 7000 rpm unless I head out of the city or am doing something a bit naughty 
For this reason, my cam size / style and due to fitment ease, I was recommended the 1 5/8 headers, even though they could have made more money out of me with more expensive bigger headers. Still, I consider stepping up sometimes.
Thread bump
I run a set of stepped 1 3/4" - 1 7/8" Kooks LTs for my H/C build (SBE LS1). As said before, lots of differences with header design, but especially the merge. ARH and Kooks are known for the velocity spike merges, and most of their power differences are gained there.
I run a set of stepped 1 3/4" - 1 7/8" Kooks LTs for my H/C build (SBE LS1). As said before, lots of differences with header design, but especially the merge. ARH and Kooks are known for the velocity spike merges, and most of their power differences are gained there.
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TECH Enthusiast
Joined: Sep 2019
Posts: 532
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Thread bump
I run a set of stepped 1 3/4" - 1 7/8" Kooks LTs for my H/C build (SBE LS1). As said before, lots of differences with header design, but especially the merge. ARH and Kooks are known for the velocity spike merges, and most of their power differences are gained there.
I run a set of stepped 1 3/4" - 1 7/8" Kooks LTs for my H/C build (SBE LS1). As said before, lots of differences with header design, but especially the merge. ARH and Kooks are known for the velocity spike merges, and most of their power differences are gained there.
Lots of big power heavy hitters run stepped headers - their benefits have been realized in many different power levels and builds. It's just not as known to most.
