atb

Here we go! 94dB goal.

kombatrok

Shiny!

GlenL

Can you describe what you've got there and how you'll assemble the pieces?

atb

Starting from the front:

Devek Level 2 1-3/4" headers
Coated by Performance Coatings Auburn, WA
Header flanges removed and stainless V band clamps installed by Colin

Headers will be going into a Y. I have a magna flow stainless 3" in / 3" out Y- merge (not pictured), but Colin is going to be making me a stainless Y from scratch that will mate to the Devek headers.

The Y will be V banded to the round Borla, which is an XR-1 Sportsman (straight through).

That will then flow into the oval Borla in the stock resonator position, which is a multi-core XR-1. These two mufflers will be welded together by a section of stainless pipe.
The shiny stinger is a straight through muffler with a directional tip, that will be mounted by a V band clamp for quiet tracks. I'll make an interchangeable exhaust tip for when sound limits aren't an issue.

The miscellaneous piping in the pic came from columbia river mandrel bending in Oregon.

This will be an all stainless (except for the headers) 3" single exhaust. Stoked to hear what it will sound like!

atb

So here's the big question, what direction should the tip point for maximum noise control? down or back?

GlenL

Thanks, Adam. I wondered about the header source (NOS?) and if there was an "X" before merging. Still not feeling the U, though. Is it just for amazing the crowd?

The answer is: Away from the mic.

atb

I see the confusion. All the piping on tbe right is just misc. stainless to be cut up to make the correct angles to join everything together. There will be a lot of welded joints in between all of the components.

Alan

... <94dB or >94dB ?

You will post a sound clip for us later right?

Alan

Alan

Adam,
Are the Devek designed Level 2 1-3/4" headers still available from someone else? - or is this a very old set made shiny & new with the coatings...? They sure do look good...

Alan

James Bailey

depends on the track and WHERE they have their sound measuring equipment....if on the right side of the track you want to have the exhaust pointed to the LEFT ! Laguna Seca you see all kinds of plumbing (literally) being added to keep legal on the typical club quiet days.

Lizard928

Ceramic coating makes them look new again.
No current new options for these headers.

atb

Ha! Well < if possible, whatever doesn't get me black flagged.

These D-II's came from the last production run made about 10(?) years ago but never paid for, so they were held by the fabricator. Wildguy on RL bought them all, a little while back. I was lucky enough to get a set. They were absolutely pristine. I coated them to protect them. It's hard to beat the packaging of these headers. The way the collectors come into the stock exhaust tunnel is awesome. Colin put V bands on, but even the flanges on the D-II's were properly clocked so the bottoms were horizontal. Those with the older MSDS know the value of this detail to design. So, the coating was more to preserve these as they aren't being made anymore. Long after my track car is gone, I'm sure there will be another 928 that could use them. These are coated inside and out.

From what Jim says, it sounds like I should attach the hanger for the stinger to a hose clamp instead of welding to the muffler itself so I can rotate it around as needed.

Sound clips for sure. Got postponed a week so will start fabricating next weekend.

Mongo

That will be louder than 94.

atb

I think it's from 50' away. I've got three mufflers. Should be close?

atb

Al Blose came out to the shop today with his skills and kick butt tool selection to tackle the track car exhaust assembly.

Kick butt tool # 1. Yes, that is a hand held band saw.



It is being used in conjunction with kick butt tool #2, which is so cool I don't even know what it's called. It's a collar/ clamp device which allows straight butt-end cuts to be made on pipe.



Al laying down the surgical TIG welds (exhaust is all stainless).



This involves kick butt tool #3. Check out the size of this TIG welder. Totally micro size, but has major power, and totally precision, and plugs into 110!



Doing some test fitting.



All three mufflers tacked together and being test fit on Tom's track car ( since it was already on the lift.) After the Y is built, the entire system gets back purged with argon and all the welds gone over.



Here's the rear muffler connected with a V-band. The mount will be attached with a hose clamp so I'll be able to rotate the muffler and control which direction the tip points. (Back or down)



The front muffler tucks in nicely into the center hump.




I'll be retaining all stock heat shields. This pic shows the front muffler fitting nicely in the cat heat shield.