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K-tuned Big Tube Swap Header 4-2-1

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58K views 60 replies 17 participants last post by  CHILD  
#1 ·
Wanted to hear real opinions about this header, I've been drowning myself in header options and need a pointer or two.

Just orderd a K20A Type R from Hmotors online, should be here within the next few weeks, going into an EG hatch platform. Doing all motor, just bolt ons for drag racing.

Everything points to Rcrew or an rcrew type of design, but I came across this and after speaking with a k-tuned rep it might be my choice and within my budget. I'm looking to spend between 500-800 for a header then match it to a 3 inch exhaust.

Does anyone have this header? Your experience with it? Any dyno results? Anyone specifically have this header with a stock k20a type r and have results?
 
#25 ·
I have this header myself. Haven't gotten my engine back together yet, but I figured I'd post so i can come back and update later with dyno results.

My engine is a 2006 tsx 88x99 12.5:1 with K600 cams and supporting valvetrain, rbc with 80mm tb, 3.5" intake, 3" kteller exhaust piping, and turn down muffler. Going to be ran on pump gas
So was this header ran on a TSX or a TSX k24a2 swap? Id really like to use this on a TSX so just curious.
 
#12 ·
The ktuned header is bigger all the way through to the exit. Weight wise, they are roughly the same. I don't own the SSR header, but if it's available when my build is tuned and JTran is willing to do some testing, I don't mind throwing it on my engine for a comparison. I don't think either header is optimal since they both weren't made for a specific setup.
 
#22 · (Edited)
they say 48mm but i'm assuming they used 1.875" piping in 16 gauge or so. That turns out to about .0625 wall thickness, which makes it 1.75" inner. Aka, they're not doing anything ground breaking here, that's a proper size for a big motor. So it should work well. with 1.75 ID and the near 3" exit as long as it's stepped in the right spots :D

and judging from that built motor picking up 8 whp with it i'd say it works well.

For anyone wondering what size tubing all that is inner diameter it's:

1.75" stepped to 1.825" secondaried to 2" and 75mm is about 2.84 inches ID
 
#30 ·
Its an 06 k24a2 with 12.5:1 supertech pistons, stock tsx rods, rrc port matched to skunk2 70mm tb, hr swap intake, type s oil pump, 50 degree vtc, 06 stock tsx cams, ktuned big tube header, 3" mandrel bent exhaust, 3" vibrant ultra quiet resonator, 3" magnaflow straight through muffler, modified oem injectors flowing 500cc. All on pump 93
 
#50 · (Edited)
Also I'm interested in the k-tuned Big Tube.

I have a K20A2 with:

- long CAI 3",
- 70mm TB + RBC
- RDX 410cc injectors
- drag cartel drop-in cams

This Big Tube can do good gain also with K20 engine and pretty quite setup?
I use my car for track days, and I like 5500-8500 rpm range

(I think I will use 2.75" (70mm) exhaust with risonator)

Thanks
Don
 
#53 · (Edited)
thanks for reply, I will remain bolt on (NA)

In Italy we have 98 octane fuel, no E85.

Now I have an header K-tuned 4-2-1 short primary, size 44mm (secondary 47mm) and stock cam.

I want to add drop-in cams by Drag Cartel and a bigger and long tri-y header, like big tube K-tuned.

instead, I think I will hold my stock throttle body tappered 68 -> 65mm (arranged at the RBC), rather than 70mm

I would get 240-245 hp, now with stock cam and small header I have 220 hp (low reading dyno)
 
#54 ·
Things to consider

...NA...98 octane fuel...
OEM Honda RDX fuel injectors are pretty sufficient :up:.

I would get 240-245 hp, now with stock cam and small header I have 220 hp (low reading dyno)
Don't forget to uprate your valve springs (s. http://www.k20a.org/forum/showthread.php?t=88917) when going beyond stock rev limit of the K20A2 (= 8.05 krpm for the EDM K20A2). DC will not be the one paying you misshift caused bend valves :D.

Markus