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Posted by: George H. Apr 9 2008, 02:03 PM

Chris

What are the differences between this exhaust and your current setup


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Posted by: Jake Raby Apr 9 2008, 02:36 PM

I see at least 4...

They are significant too....

Chris can explain! We have done LOTS of tuning on the system in the past couple of years.

Posted by: ericread Apr 9 2008, 02:42 PM

Posted by: Racer Chris Apr 9 2008, 04:28 PM

The system shown is my first generation product. The design comes from Garretson in CA, was first produced in the '80s, and is intended for engines operating up to 8000 rpm.
I struggled with the difficulties of making the primaries equal length, and as short as the engineering criteria provided to me specified. The breakthrough came when I redesigned the collectors to a splayed inlet instead of a parallel inlet, which allowed me to get all 4 primaries within 1/2" of the design parameters. I have been told by a PhD aerospace engineer that my collectors are probably more efficient as well.
At the same time as I reconfigured the header I came up with a single muffler for street applications that incorporates sound reduction features of both the silencers shown. The new silencer exits in the stock location instead of the opposite side, and the EVO II silencers are 100% stainless instead of a mix of mild and stainless steels. The Phase 9 and Quiet Can shown are coated with the same high temp product as the header to make up for the non-stainless composition.
Recently I made upgrades to the stub pipes in an effort to reduce the likelihood of cracks forming in the tube around the mounting tabs. The stubs shown are made of T304 stainless tubing with mild steel tabs. My new stubs are T321 high temp stainless with T304 mounting tabs. The shape of the tabs is also changed slightly. They now have a slot instead of a hole so the stubs can be more precisely aligned with the exhaust port on the head and bent studs are less of a problem for mounting.
The latest change I made is the introduction of a street length header after Jake's dyno research indicated that longer primaries would be better on engines with peak power below 6500 rpm. I now offer both race length and street length headers. The primaries are 3+ inches longer on the street header.

The Super Header shown is capable of supporting the same general displacement and engine output as my 1 5/8" EVO header. The EVO header will provide higher peak power due to more precisely controlled primary lengths, but the difference is not as dramatic as the difference from other commonly available exhaust systems.

The replacement cost for that header, with heat exchanger, is $2390. It is a steal at anything less than $1800.

Posted by: George H. Apr 9 2008, 06:28 PM

Thanks for the info Chris

Posted by: jasons Apr 9 2008, 06:36 PM

Were you the winner of that bird board deal?

Posted by: George H. Apr 9 2008, 06:40 PM

who me?




where you the guy trying to snipe it out from beneath me

Posted by: jasons Apr 9 2008, 07:12 PM

Well, I was the first person to reply to the thread. I guess my reply was too late. Just as well, I didn't need to spend the money. That was a GREAT deal.

Posted by: George H. Apr 9 2008, 07:23 PM

I had emailed him the night before you posted to his thread

Posted by: jasons Apr 9 2008, 07:34 PM

Congrats! When I posted, I figured I was already too late.

Posted by: Mark Henry Apr 9 2008, 08:09 PM

That would be me....

Posted by: George H. Apr 9 2008, 08:20 PM

Fair enough


You get a pass because of your last name

ups says it's on my porch as we speak