BigBoost S55 Stage 3 Twin Turbos

doublespaces

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Oct 18, 2016
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Big Boost will be announcing a release and pre-order date next week on a new set of upgraded twin turbos for the S55. We have been told they are stainless investment castings with a 40% larger area in the exhaust turbofold over stock, dual ball bearing and inconel lightweight turbine wheel/shaft. As for power potential, we’re told the compressor wheels will be a billet aluminum for 800-1000 whp or titanium for 1000+ whp.

Perhaps most notably, this fits OEM style downpipes so if you have already invested into after market downpipes that can be re-used. Additionally, they are providing the intakes/chargepipes.


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wheela

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Jun 4, 2021
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Bringing this one back! Are these available? anyone using these yet??
I'm curious about your curiosity in s55 turbos. Picking up an s55? Considering use on n54? Other??? Not that it's my business, just curious if you're cooking up something cool😁
 

Dumaurier7

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May 19, 2020
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........But seriously, at the moment I am working to resurrect my F22 after the slight disagreement with the pole! :cry: , I have become so happy now with my E89 and the way the upgraded twins deliver power, my plan is to sell off the BW8474 single and switch over to upgraded S55 twins, I already have the A2W intercooler set up, so I'll be doing my very own homemade version of the F87 M2 comp. :sunglasses:I will be changing the block (it was damaged in the crash) so I will be doing an upgraded block with pistons and rods with the S55 oil pan and oil pumps too.
 
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Motown65

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Sep 12, 2022
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I could never find anyone with a pair. I ended up going ps2+ but i feel theres too much back pressure up top. You should get a set and document them
 

Dumaurier7

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I went ahead and ordered them; my cores should arrive this week and they are promised a week after, so I guess we'll see.
 
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Motown65

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Sep 12, 2022
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I went ahead and ordered them; my cores should arrive this week and they are promised a week after, so I guess we'll see.
Nice! I thought they had larger exhaust housings but I guess they reuse stock and the intake housing is their own cast. I feel like the exhaust backpressure is whats limiting the s55 though.