Extractors!!!??

[dove grey 64]

i like and agree with willowfans setup, also bill sherwoods opinion is the same

[Delazy]

I've personally got the 2nd set of power craft 4-1's...sitting pretty in my bedroom ATM...amazing gear! Perfection even!

Results are hard to gauge given I haven't had them on a running motor, but old mate ken had them on his highly strung 4a and rated them highly...

[Garth]

From my real-world experience with them on my old 16v setup (from when it was completely standard to when it was built to similar spec dario has listed for his planned engine), I didn't experience much in the way of bottom end losses, certainly nothing similar to the 15% drop on the TODA spec if anything. They did make a big difference to the power delivery though. In its final 'built' tune, it made 85kW and had a very nice torque curve with a meaty midrange from 3k upwards. But I digress.

Sure, the materials and construction don't compare to my TRD BEAMS headers, but then again they weren't $1800 either... Still, the Kaizen headers are well constructed - certainly for the $300~ price - and I never had a crack or any quality-related problem with them in the 5+ years i ran them across various stages of engine builds.

Exactly this, and it goes both ways. I think theres more to the technical design of exhaust headers, than any generalised 'rule' that one type is better than the other for a specific application. For ultimate performance, it all comes down to tailoring a solution to suit the driving type and the build specification of the engine.

Dario: Ultimately, you will be better off getting something cheap now (like the Kaizen ones) for the standard engine (or sticking with your std ones and porting them a bit), and something custom made later to suit the exact bench-flowed rate of your built engine - that is if you're worried about the very specific tiny % increases these pre-made headers will allow/disallow. There simply is no single 'ideal design' that suits both a standard 4A or a high-po 4A monster.

Hope that helps

[Anthony]

I agree with your point on construction Sam the headers I sell are definitely made to a price, a price which a lot of people like. But do you have a comparison power figure? Curious to see some back to back testing results on a few header types if you do.

[JDM-086]

i appreciate all the feedback. a lot of which is very helpful! yet im still caught in 2 minds (or 4 lol )... although i have narrowed it down!

its a toss up between ( in order of which im leaning towards most to least) :

Reinhard - $750 (like the brand, quality and design looks good)
Power craft 2 - $780 (reputable brand, high quality, design looks simple and straight forward. however these i believe are second hand which im not keen on)
Kaizen - $320 ( solid well made option, proven and tested here. well priced. but unsure if it offers anything more than a standard manifold aside from exhaust note )
Power craft 1 - $550 (assuming purely on brand they are of good quality. but for the $200 price difference id rather either fork out and get something nicer like the reinhards or save and get kaizens )

i have eliminated the yahoo specials, purely because its coming from jp and its an unknown brand ie. quality is unknown. and 5zigen im not a fan of.
i have until sunday to decide or ill miss the container

[xero]

i have to agree with garth on this.
on my original mild smallport 16v they were great (the rest of the exhaust was fairly average though) and was making similar power to garths 16v. then after the hi-comp rebuild (12.5:1 comp) they were still god enough. in fact with the stock intake, high comp, and some mild port work it 80rwkw.
i then got some custom extractors and 2.5 exhaust to suit the engine and with quads i only made 85rwkw but had more power under the curve. the only reason i got rid of those extractors was they were becoming a restriction (as well as the stupid standard cams) with the hi-comp motor.

infact cerby86 has these extractors as well as quads and stock ECU (i think, im bit vague with out going back through 300 pics from annual last year) and he has 80rwkw. as ant says they are produced to a price point but does not detract from the performance they provide.

[tuned86]

i had a powercraft 4-2-1 design made for my 20v. Unfortunately sold them before i got to run'em since i decided to on a different engine. Construction looked like it was machined tig'd though i'm sure it was done by hand. Amazing quality and reasonable price compared to toda. I see lots of KMS on hipo ae86 in japan, must seem like they work. I have a set of RSR on my stock 16v and don't feel as torquey as a stock manifold/4-2-1 equivalent but it still goes and i just rev higher coz my powerbands just shifted accordingly (but also coz of 2.25" catback system as well).

[JDM-086]

i decided to go with the 4-1 kaizen extractors.. i figured these will do in the mean time until the motor is built then ill go from there. im hoping these extractors do provide some improvement. the rest of the exhaust will be mild steel 2.25" with a resonator and dual tip muffler having 2.5" tips

[xero]

thats pretty much what i had and garth had, should give you somewhere around 80-85rwkw (assuming ECU, intake etc etc). and believe me it will be plenty fast enough!