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Old 06-19-2012, 05:35 PM   #1
Jason@Nameless
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Drives: '88 BMW 535is Turbo
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Nameless Performance Equal Length Stepped Header

We just wrapped up our first equal length stepped header for the BRZ, featuring mandrel bent T304 stainless construction and an optional high flow catalytic converter in the factory location for SCCA racing compliance. We're excited to take this and the next design or two we are working on to the dyno on Thursday.



So far this is what we have got to show - the first prototype system is a Tri-Y design featuring 1.625" equal length (within 0.8%/.125") primaries and equal length (within 8%/.5") 1.750" secondaries into a 200 cell high flow catalytic converter with a 2.5" outlet to the over-pipe (will be fabricating a 2.5" overpipe also). There are two secondaries at the bend that is facing left, they are stacked on top of each other, and the higher of the two is not visible in the photo. This header does fit in the factory skidtray and ceramic coating will be an option. We have also discussed a faceted sheet metal heat shield.

Our goal is to include our customers in our development process at every turn and we've got a fork in the road to determine which of the four other design ideas we should test first. So we'd like your input. According to our exhaust flow dynamics software the existing design is optimal with secondary runners being of a length that requires the removal of the catalytic converter. We were considering replicating this system exactly with long 1.75" secondaries in place of the catalytic converter. This would most likely require a jetted secondary oxygen sensor fooler to keep from throwing a check engine light.

Alternately, we can build out a torque biasing design using 1.5" primary pipes and 1.625" secondary tubing with a high flow catalytic converter like the first design. The other alternatives are to run a long tube stepped 4-1 design with or without a catalytic converter but utilizing one of the above primary/secondary sizes, or going up in size (not looking terribly favorable from our preliminary calculations).

So what would you like to see, we would love to have your feedback. All of the designs will probably get prototyped one way or the other. This is the first production header we will be offering and we'd like to gain as much development knowledge as possible from the process.

Lets chat!

Jason Griffith
Engineering Director
Nameless Performance

Last edited by Jason@Nameless; 06-20-2012 at 04:27 AM.
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