Shadowman's Latest Exhaust Tweak


Aug 25, 2006
4,436
They say that an idle mind is bound to find trouble as such I do my level best to always have numerous projects underway and or being considered.

In any case; after driving my gal the 1000 miles or so to SoCal for the rally I find that I am getting old. As much as I enjoy the Stainless Work's exhaust there were a few times that it had just a bit too much "bite". The best way I can describe it is as follows; when you initially bring her to life it is akin to waking the dead and then she quickly settles into a nice deep throaty idle; this I like very much. Then when traveling through town while running through the gears always brings a huge smile and then follow this with a methodical cruise down the highway at a fixed speed; meaning without load the smile never fades.

However there were a few times when I was under a moderate load for an extended period of time such as when I traveled over California's Grape Vine where the grade is significant and constant for many miles that I would have like her to be a little less edgy. So much so that I shared this with Rich and Dennis aka The GT Guys upon my arrival in SoCal and then a few days later made mention of it to Bony. Bony simply replied by saying "she sounds great at 2000 RPM no drone I simply cruise along listening to the radio" to which I said; with the window opened or closed to which he said "with the windows up of course; don't you drive with them up too". I had to smile because typically I do not even if the A/C or heat are on I still enjoy the air movement

In any case because my gal has the rear bumper deleted and the fact that I wanted to retain that which I refer to as her "Heidi Fliece Ass" the options available to me were quickly narrowed to one.

Once the decision was made and the direction defined the process commenced

Initially I expected to be able to acquire a wide variety of internal aka pre-production exhaust pieces however I quickly found that this was not to be the case as such I purchased two bullets aka glass packs before they were completed and made ready for retail sale. I took these two bullets and as you will see in the picture cut them open and then cut the internal pieces until what remained were two short fluted pieces from which I would create my baffles.

The next step was to integrate them into the "H-Pipe" in such a manner so as not to change her looks, remain serviceable, and be of a quality befitting of my gal. After several failed ideas we took a piece of stainless steel and fabricated a collar in which the fluted insert could be fit into position and then Tig welded. We machined the collar with an internal step so that from the outside of the gal; meaning looking at the tips up close and personal you do not see the end of the fluted piece instead what you see is a nice stainless steel lip that extends into the "H-Pipe" 5/16". Then we machined it for a 10-32 button-head socket cap screw to insure that once in position it would remain. Now FYI the machined stainless steel collar fits very snugly as it slides into the "H-Pipe" so the securing screw will do very little work. Even as snug as the fit is the baffles are relatively easy to remove as I had them in and out several times during the fit confirmation process.

Once the pieces were completed and dry fit into position the securing holes were drilled in the "H-Pipe", the fluted barrels were wrapped with OEM glass pack material and the "wholla" they slipped into position as if there from day one.

I can share that she still has the heart and voice of a lion however the results of the process are exactly as expected; the extreme bite is gone and an unexpected (at least for me because I know that many like the following) benefit is that the deceleration cackling was significant reduced.

In closing did I ever consider taking the Stainless Works exhauist off; "NO" as it is a simply wonderful looking and sounding system however similar to the mounting hardware tweak that I designed I simply fouind myself wanting a slight noise tweak too

Takes care

Shadowman
 

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I would not normally do this; meaning post a back to back reply however I need to upload two more pictures showing the baffles installed on my gal

Enjoy

Shadowman
 

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Very nice. This was the issue I had with the X-Pipe/H-Pipe set-ups. They sound great but they have a "lions roar" at times when I just want the kitty to purr.

I opt'd for the Borla (which is a bit tame) but it was the only option that suited my needs at the time. I would love to hear this beast sometime. Unfortunately, I don't think these sounds can be fully appreciated via a recording... so the next get-together your attendance will be required.
 
Shadowman exhaust mod

As all your mods are - too sano (aka cool). I like it.

Ed
 
Nice work Bill !! I've played with some Vortec Cones but the glass pack idea is cool !!
 
Nice work Bill !! I've played with some Vortec Cones but the glass pack idea is cool !!

Did you notice any difference with the Vortec Cones?
 
Did you notice any difference with the Vortec Cones?

I took my x pipe off to wrap it with insulation. While I had it apart I installed them between the cats and the inlet of the xpipe. It took some of the full throttle harshness away but no major noticeable difference. I may try them in outlet of the pipes but I'll need to make some custom tips first.
 
Great Stuff As Usual

Reminds me of something my girlfriend has said ..... "there's no perfect relationship, only perfect moments". And this system provides plenty of perfect moments, but also some that are a touch more imperfect than I might like. While I absolutely love most everything about this system, the harshness and db level upon startup and >3,500 rpm are a bit excessive. In terms of looks, weight reduction and heat reduction it's a phenomenal system.

Shadowman's work is of course first rate and will without a doubt improve upon one of the system's imperfections. Has there been any dialogue with Stainless Works involving the production of your design so that others might benefit from this effort? I for one would be very interested in such add-on pieces
 
Aside from loudness, change to sound? I'd love for the sound to be a deeper "muscle" sound.

Had also thought about putting some kid of glass pack in line, or even some of the chambered exahust like off a 65 vintage Corvette. Don't know if either would work.
 
Aside from loudness, change to sound? I'd love for the sound to be a deeper "muscle" sound.

Had also thought about putting some kid of glass pack in line, or even some of the chambered exahust like off a 65 vintage Corvette. Don't know if either would work.

HUGE......................... it is simply perfect.

Yes it deeped the tone and even more so now under WOT certainly she roars however I can actually hear the motor...... not just her voice.

FYI; initially I was happy with the results however early this am 2:00 to be specific we went out and played for a couple hours and it is even nicer than I had hoped for

Lastly; when I was in SoCal The GT Guys removed an exhaust that had the cones before the X pipe on a gal and one was burned through and the other not far behind futhermore they do not so much capture but rather alter however in the case of the glass pack or ??? there is a capturing that takes place.


Takes care

Shadowman
 
Reminds me of something my girlfriend has said ..... "there's no perfect relationship, only perfect moments". And this system provides plenty of perfect moments, but also some that are a touch more imperfect than I might like. While I absolutely love most everything about this system, the harshness and db level upon startup and >3,500 rpm are a bit excessive. In terms of looks, weight reduction and heat reduction it's a phenomenal system.

Shadowman's work is of course first rate and will without a doubt improve upon one of the system's imperfections. Has there been any dialogue with Stainless Works involving the production of your design so that others might benefit from this effort? I for one would be very interested in such add-on pieces


Not yet however I will be forwarding this link to them and then following up with a phone call to see what options can be made available.

BTW: I always like the sound at start up......full on bussiness; she flat out roars however then within a minute she settles down into a deep throaty rumble. The area that bothered me was modeate load driving for an extended period of time.

Takes care

Shadowman
 
** UPDATE **

I just heard from Jim at Stainless Works after he looked at this thread. He has asked me to send him the data points on the baffles/inserts as this is something that they would like to consider.

Once again Stainless Works has shown that they care and that they take user input seriously; THUMBS UP

Shadowman
 
I know it took my Viper awhile to settle down after headers and exhaust, this is due to the computer getting used to the new system. After a few hundred miles it seems like my stainless system is also getting a little tamer. Am I just getting imagining this or do you think GT computers also have a learning curve?
 
I know it took my Viper awhile to settle down after headers and exhaust, this is due to the computer getting used to the new system. After a few hundred miles it seems like my stainless system is also getting a little tamer. Am I just getting imagining this or do you think GT computers also have a learning curve?

Yes sir the PCM does learn over time; this assumes that this was not disabled during the tuning process

Takes care

Shadowman
 
Yes sir the PCM does learn over time; this assumes that this was not disabled during the tuning process

Takes care

Shadowman


Sounds like a typical proverbial swan song to me.
 
This is correct, but only thing that I am aware of that the GT learns is the A/F ratio during closed loop operation. The information can be also used for open loop corrections if the tune has that enabled. For example if the left bank is running a little lean and fuel may be added during open loop for the left bank also. Only if the tune allows it.
 
Sounds like a typical proverbial swan song to me.

For all that are reading this particular reply it was directed at me;

Now KrazyPSI you are a funny man; as I wrote the phrase "swan song" I was not certain that is would have the same meaning when received in another country. It is good to see that everything so far except for the $$ exchange rate and the cost to export "from" your country remain very similar... LOL

All the best my friend

Shadowman
 
I know it took my Viper awhile to settle down after headers and exhaust, this is due to the computer getting used to the new system. After a few hundred miles it seems like my stainless system is also getting a little tamer. Am I just getting imagining this or do you think GT computers also have a learning curve?
I believe that seasoning of the exhaust system tends to soften the sound a touch. This essentially relates to the buildup of carbon in the pipes which absorbs some of the sound.
 
New Exhaust

I did it in a similar fashion but didn't want to restrict the flow. I also can change the sound anytime I want. The muffler inserts can be packed with stainless wool or fiberglass muffler packing.
 

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I did it in a similar fashion but didn't want to restrict the flow. I also can change the sound anytime I want. The muffler inserts can be packed with stainless wool or fiberglass muffler packing.

Thank you for sharing

I am not sure what you mean by reduced flow and not wanting to as such you created these inserts

In a glass pack design certainly the core size is a consideration however the basic premise is that a portion of the exhaust based on the inverted flute design of the baffle/insert is routed into and through the glass or ?? wrap creating a muffler of sorts. FYI; the cores that I used are 2 1/2" which when considering the freeflow nature of the exhaust system with no mufflers is still much less restrictive than when compared to OEM nevertheless your point was recognized.

Now if I am correct your design is such that you can rotate the dial so to speak; is this correct? If yes then your design could significantly reduce the flow based on the open area. Now if this is not the case and your design is a fixed opened design then the inner tube appears small.

Regardless I think that it is great to show and share an alternative; your idea/system may actually work better for folks looking for the means to alter the sound without removing baffles/inserts.

In the case of my gal I am very happy with her new voice

All the best

Shadowman
 
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