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Old 02-13-2009, 06:00 PM   #1
AMR
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Default NEW RELEASE: AMR 2" Race Header - ONE OF A KIND!

We just released out "AMR RACE HEADER" for the Subaru Community. This header is very unique and one of a kind. First we will start off with the specifications of the header.

The header is made out of 304 U.S.A. stainless. Each tube is mandrel bent to ensure smooth flow. It is equipped with our custom CNC 1/2 thick flanges to ensure no warping. Each tube is equally tuned. Just like all AMR Products, they are made in-house!

Pictures:











Dyno Plot:





Customer:

William

Vehicle:
2008 Subaru STi

Mods:
- AMR BMI Cold Air System
- AMR Stealth-Back Exhaust (stock muffler)
- AMR Turbo Hard Pipe
- AMR Top Mount Intercooler
- AMR 750cc Injectors
- STOCK TURBO!


Notes:

We had done a conservative tune on the vehicle. AFR's in the low 11's. Boost was around 19psi. Vehicle made 294whp / 340wtq. This was on the stock header.

We then installed the new AMR Race Header along with a re-mapped AVCS map to suite header. First pull we had a gain of 18whp / 20wtq at the same boost level. AFR's richened up to mid 10's. We leaned the vehicle back out to 11.3-11.1 afr taper along with some more AVCS INT & EXH mapping and 2 more psi of boost (21psi) we saw a total gain of 32whp / 40wtq. Timing was left un-touch hitting 15* at full boost and 19* up top. We did notice the knock correction was not as sensitive after continous dyno pulls as normally would be which is a plus along with no loss in spool!! We could have given more timing up stairs to increase/level the HP but after the customer went for a ride and felt the difference, he stated "no need".



-Rob
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Last edited by AMR; 02-17-2009 at 01:25 PM. Reason: typo - updated pic
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Old 02-13-2009, 06:03 PM   #2
Phatron
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you think the stock muffler is significantly increasing the backpressure over an aftermarket unit?
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Old 02-13-2009, 06:07 PM   #3
battousai
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oooh.. that's an interesting looking piece. Any pictures or videos of it installed?
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Old 02-13-2009, 06:46 PM   #4
Badazzcr
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4 Making them
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someone needs to take a welding class
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Old 02-13-2009, 06:47 PM   #5
DuCash
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Price Please......
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Old 02-13-2009, 07:07 PM   #6
SUBYS R US
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Quote:
Originally Posted by Badazzcr View Post
someone needs to take a welding class
who cares if there pretty or not. as long as they wernt cold are to fast then it should be fine. also no blow through
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Old 02-13-2009, 07:44 PM   #7
modaddict
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So your AFR's went RICH when you installed a header?

You would think IF you increased VE that they would go lean if the processor was untouched.
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Old 02-13-2009, 07:46 PM   #8
STi-MAN
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looks like the prototype is of better material then the production version.. any shots of the collector in the production model?
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Old 02-13-2009, 07:50 PM   #9
Freon
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Quote:
Originally Posted by modaddict View Post
So your AFR's went RICH when you installed a header?

You would think IF you increased VE that they would go lean if the processor was untouched.
Mass airflow sensor...

OP: AMR vs. FR on header primary diameter. FIGHT!
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Old 02-13-2009, 08:02 PM   #10
RiftsWRX
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Quote:
Originally Posted by Badazzcr View Post
someone needs to take a welding class
... and people call me blunt!


/OT
I was just going to say that someone needs to learn how to use a camera.

Sorry, I'm more anal about my photography, then I am tuning.



/on topic

Otherwise, props for at least trying something different! Though I'd love to know what type of ramp rate you're using on that DD, to run timing like that! If I tried to do that, on our 93, in 4th, on our dynojet, an '08 would implode!

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 02-13-2009, 08:22 PM   #11
juanmedina
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Quote:
Originally Posted by Badazzcr View Post
someone needs to take a welding class
haha I know, how much they weight? like 30lbs.
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Old 02-13-2009, 08:49 PM   #12
SuperSTI
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wow looks sick
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Old 02-13-2009, 09:04 PM   #13
AMR
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Default

Quote:
Originally Posted by STi-MAN View Post
looks like the prototype is of better material then the production version.. any shots of the collector in the production model?
Its just the lighting in the picture that makes one look different than the other. They are identical in material.


-Rob


Quote:
Originally Posted by RiftsWRX View Post
... and people call me blunt!


/OT
I was just going to say that someone needs to learn how to use a camera.

Sorry, I'm more anal about my photography, then I am tuning.



/on topic

Otherwise, props for at least trying something different! Though I'd love to know what type of ramp rate you're using on that DD, to run timing like that! If I tried to do that, on our 93, in 4th, on our dynojet, an '08 would implode!

Jorge (RiftsWRX)
www.ProjectWRX.com
Ramp Rate on the dyno was 100-110. I never use more than that. 4th gear.

I know I need a better camera, not bad for quick shop pics.


-Rob
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Old 02-14-2009, 01:40 AM   #14
socalLGT
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Not sure if I like how the primaries are the same diameter as the secondaries. Must be nice to have 93 octane fuel... I can only dream of running 15* of timing with 21 psi at 11.3:1 AFR
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Old 02-14-2009, 02:56 AM   #15
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Quote:
Originally Posted by juanmedina View Post
haha I know, how much they weight? like 30lbs.
how does that have to do with anything?
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Old 02-14-2009, 02:12 PM   #16
achavez
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looks good
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Old 02-14-2009, 02:19 PM   #17
BigRigger
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pmd you
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Old 02-14-2009, 02:20 PM   #18
WrXtaCy2003
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this car made more power because it was running more boost. Did the headers help make power? Maybe. If the run with the headers was done at the same psi of boost as the stock unit, you would have a better side by side comparison. If you were to argue that the aftermarket unit "allowed" you to run more boost, to make more power, that is another story.

DK
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Old 02-14-2009, 03:41 PM   #19
midnight2.5rs-t
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it also says at the same boost they picked up 18whp and 20wtq
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Old 02-14-2009, 03:50 PM   #20
Mr_Snips
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out of curiosity what does it do for the actual flow velocity?

seems like there would be a big loss where the other bank joins the bank closest to the turbo without the tubing enlarging for the extra flow.
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Old 02-14-2009, 04:51 PM   #21
RiftsWRX
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If they want to get a REAL comparison of improved flow, toss a boost gauge in and actually measure exhaust pressure and do a simple BP/EP comparison across various levels of tune, then do the same with the factory unit.

For those who KNOW what they're looking for, THAT will sell product.

Some constructive criticism!

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 02-14-2009, 05:29 PM   #22
WrXtaCy2003
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Quote:
Originally Posted by midnight2.5rs-t View Post
it also says at the same boost they picked up 18whp and 20wtq
missed that sry

DK
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Old 02-14-2009, 06:40 PM   #23
midnight2.5rs-t
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it happens I have done it plenty of times also
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Old 02-14-2009, 07:30 PM   #24
madmax718
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The welding is alright, its not perfect, but as someone said, the proto looks better than the production.

Im not fully convinced that simply increasing the diameter is all that helpful. In fact, I think you might have reduced velocity.
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Old 02-14-2009, 09:55 PM   #25
BigRigger
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I just finished reading this book



Its a little old but the math and theroy are sound, plus they use the subaru motor examples alot.

There is a math formula for the displacement and induction systems to tell you how wide your pipes should be. They also say the wider the pipe, the more power you "CAN" get but your powerband is not as wide, same goes for the reverse. Skinny pipe means wide powerband but loss of peak hp.
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