Best sounding turbo outlet pipe (RB20/25)

[Bennis]

I mean, I think half the reason  they sound so good is  because they are not using traditional  merge collectors. The original gtsr unit has a flat style collector, the reproductions shown in this thread have angle-cut pipes, but the collection is still "flat".  

Could  one not just use two 3-1 flat collectors and the exact same pipe lengths as the original item?  

Then again,  I can't fabricate so I could be missing something obvious here.

[iruvyouskyrine]

Whilst i would absolutely love a genuine R31house item i would never support speedtek in any way shape or form, even if i was receiving a free manifold from them. f**k speedtek.

[LaurelPWR]

The speedtek manifolds don't even come close to the quality of the R31house equal length, single piece, hand bend runners.....
They're no where near equal length either.

I've spend literally hundreds of hours searching and attempting to translate any info over the years on gts-r manifolds and especially the R31house manifolds and his journey to recreate "that sound" and from what I have found, there's been three iterations all up now.

The first was the long large diameter merge type:


The second iteration is the one I have called "max" :


And the latest version 3 is the "premium" which just launched a few months ago, here's a pic of one with an original gts-r:


I managed to translate a blog post from R31house from a few months ago stating that the particular sound that R31house refer to as "that sound" comes from the pressed plate steel merge collector on the original Hr31 gts-r manifold and they've only now with modern tech been able to 100% recreate the original and finally achieve the 20 year long goal.

Another interesting translation was that he said he felt his car lost response and power with the v3 "premium" compared to the v2 "max" because the runners end at the start of the plate steel merge with the openings facing directly at the inner front flat face of the merge collector and this creates turbulence BUT is the precise cause of "that sound".

I also have seen two versions of the actual RB20det-R GTS-R manifolds as well, the normal 1-800 homologation Hr31 gts-r manifold with press bent like runners and heaps of splatter from the welds Etc.:


Then there's the Hr31's that the racing teams like Reebok, Calsonic and Gibson etc. received and the manifolds they had was the same design with much, much higher quality materials, runner bending and welding...


The ReeBok car:


I even tracked one down 5-6 years ago on a sale thread and contacted the guy selling it and it turned out he was an actual mechanic for Gibson Motorsport and the manifold he had (sold) was unused because when they received the hr31 race cars, Gibson removed the manifolds immediately in place for the custom Aussie made Gibson manifolds, this is that actual for sale thread photograph:


And obviously this is the Gibson manifold:


*all photos taken from google

[niZmO_Man]

Great info.

[Dose Pipe Sutututu]

wow, you're like manifold Yoda haha

[LaurelPWR]

I genuinely love these manifolds and live to share the information to those who also have a genuine interest (:

And I have actually left out a couple of others hahah...

The Hr31 Autech had shorter runners and a smaller merge collector into a t28 flange which was widely rumoured to spool a lot faster and produce better numbers than the gts-r manifold even though it's wasn't equal length:



R31house has also done a couple of the Autech recreations in the "max" v2 style, note the unequal runners:

[niZmO_Man]

Especially once you hear one at full tilt fly past you, for example, down the main straight at Eastern Creek.

[LaurelPWR]

Just had this arrive fresh from the motherland, a piece from the owner of R31house’s personal inventory..... A brand new completely unused GTS-R turbo manifold still with the original Nissan part number label on it ?
Feast your eyes.....

[= NISMO FREAK =]

posting just to say f**k yeahhh this thread is awesome and thanks for all the info.

 

also can we be friends laurelpwr? ?

[KiwiRS4T]

Interesting to note that the Reebok car managed with the stock inlet manifold...

[niZmO_Man]

Yeah but look at the difference in welds between the street and race versions.

Also, Nismo wouldn't let Gibson line his cars up with theirs for whatever reasons...