Eric5280

Great results and very-thorough post, thank you for taking the time to do this and share with the community.

Alan C.

Kareem,

Thanks for your time and posting the results. Nice car.

Accel Junky

Interesting result with the specific dyno setup. The question is...what speeds does the setup simulate? As in will this power gain occur at vehicle speeds only above a certain MPH? I believe the ram air effect based on rules of thumb I've seen is so marginal that I doubt that much is gained from that aspect.

KareemGT4

Accel junky: this is all done in 4th gear.. I think also simulating cold air on a dyno is diffucult, doing it in the wild is much much easier to get cold air. I still believe on the street the power is more! It feels more. It doesn't feel lethargic under 5k now, it feels powerful all the way from 3k to redline.

I would also like to add another impressive point: this system has ZERO drone with valves on or OFF. Believe it or not valves closed even sounds quieter than stock for some reason!

RealityGT

Actually I can read perfectly fine. I guess my office filters may be blocking the attachment.

RealityGT

I can see your dyno sheet now.. but!
Why are they using STD and not SAE correction. That alone could be delivering the higher/inflated numbers. (I believe +3% with STD)
-Strange overlay that doesn't show 5250 x (RPM missing)
-You should ask your shop to send you the #'s in SAE..
-Curious to hear why your speed shop would dyno and not use the more accurate SAE correction..

Alan C.

No torque curve so no 5250 X over.

KareemGT4

i'm not a dyno expert, i'm just a car dude who wanted to know if the headers made power on the my car or not! We also had a problem getting the torque values. The point is, these headers make power we all should stop getting into the small silly details and enjoy our cars with their glorious noises!

Alan C.

Kareem, I agree. Glad your enjoying your headers. With a little luck with the weather I hope to get mine out this week.

Nick Yoskin

Investment casting allows for smoother transitions.

Alan C.

I wonder how many people would port match the heads to take advantage of the incremental gain of the cast flange?

FJSeattle

SAE SAE its not valid unless its SAE!@!!@$#@R

Yargk

Just caught up with this thread. Thank you very much Rick Deman for providing data.

jmartpr

Has anybody taken the time to test the other brands header using all the DMS specific procedures for dyno testing? Also, the before and after should be done using the same method so any HP gain is under the same conditions....my before/after dyno were definitely not done using the DMS procedures so I can't compare these dyno tests with mine.

KareemGT4

both stock and post runs were done as same procedure.