Active exhaust modification on SRT8 - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 43 (permalink) Old 09-05-2013, 05:16 PM Thread Starter
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Question Active exhaust modification on SRT8

Hi guys,

I'm tempted to play around the exhaust valves and see what difference it makes - as per this article here.
How To: 2ND Gen deactivate the active exhaust valve on the 6.4L (2nd gen SRT)

Few questions.
  1. Has anyone done this besides 300CBlackBeast?
  2. Has anyone done this AFTER installing an after market exhaust, to see what difference it made on top of the after market exhaust?
  3. Has anyone done this AFTER removing the rear resonators/mufflers?
  4. What do you notice after doing this mod, more backfiring/popping on deceleration?

Cheers
Jeff
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post #2 of 43 (permalink) Old 09-05-2013, 05:50 PM
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Must admit been tempted. It would be interesting to test by just going one click and then testing, then doing the next click etc



I want to die peacefully in my sleep, like my grandfather.. Not screaming and yelling like the passengers in his car.
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post #3 of 43 (permalink) Old 09-05-2013, 06:18 PM
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My Corsa catback eliminates the valves in the exhaust. I love the Corsa sound, and really don't know why they put valves in at all. There are no negative effects on the sound when they're gone......if someone wants to leave these open, I would just have them cut out and replaced with straight pipe. Would be simple.

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Audi A6 2.7T
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Volvo S60R
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post #4 of 43 (permalink) Old 09-05-2013, 06:38 PM Thread Starter
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Quote:
Originally Posted by dp300 View Post
My Corsa catback eliminates the valves in the exhaust. I love the Corsa sound, and really don't know why they put valves in at all. There are no negative effects on the sound when they're gone......if someone wants to leave these open, I would just have them cut out and replaced with straight pipe. Would be simple.
Interesting. They most likely did it to keep it a bit more restrained for the 'luxury' appeal that the SRT8 has - or maybe to meet legal dB requirements?

Would be interesting to see if someone has installed an exhaust which retains the valves, and tested with/without the valve open to see how much of a difference it makes.

Moparlife - very tempted to do this weekend, if I get some spare time up my sleeves.

Last edited by Sonic57; 09-05-2013 at 06:39 PM.
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post #5 of 43 (permalink) Old 09-05-2013, 06:49 PM
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Quote:
Originally Posted by Sonic57 View Post
Interesting. They most likely did it to keep it a bit more restrained for the 'luxury' appeal that the SRT8 has - or maybe to meet legal dB requirements?

Would be interesting to see if someone has installed an exhaust which retains the valves, and tested with/without the valve open to see how much of a difference it makes.

Moparlife - very tempted to do this weekend, if I get some spare time up my sleeves.
Well, I have the Xtreme, which is the "louder" of the two models (Sport is the other). I would not want an exhaust any quieter than what I have. Now, with Magnaflow, or some of the other louder models, maybe the valves are noticeable when they are open or closed, but the Corsa sounds great without them, and I doubt there would be much difference with or without them.

Last edited by dp300; 09-05-2013 at 06:50 PM.
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post #6 of 43 (permalink) Old 09-05-2013, 08:12 PM
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When you install a cat back system, the valves go away with the original exhaust. I ran the stock exhaust with the valve mod as listed in the post, and it did sound much deeper at idle but did have the drone when cruising. The valves are there to keep the drone down when the engine switches to econ mode (mds) and is running on 4 cylinders. As stated, when you install a cat back as I did with the Magnaflow, the active valves are still attached to the stock system that you remove, so they are out of the picture altogether unless you cut them out and install them in the aftermarket system. As far as "clicks", you will see when you start messing with it that the spring is in a notch that you may have to pry open (there are 4 notches) that keeps the valve ALMOST closed. At least that's the way it was on my car. Not quite spring loaded to closed, but just enough to keep them in the closed position. Mine looked a little different than the ones in the picture. It only takes one notch (90deg) to keep the valve open. If you want to keep it spring loaded to open, you can go 180 deg, but it's not necessary. You can check the sound difference by having the car up on ramps in the rear, start the car, and go underneath and open the valves by hand with pliers. You will hear the difference. I ended up going back to the stock exhaust with the valves in the stock position because it's more of a sleeper that way.

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post #7 of 43 (permalink) Old 09-05-2013, 08:54 PM Thread Starter
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Excellent post Cannon. Thanks for that.
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post #8 of 43 (permalink) Old 09-05-2013, 10:07 PM
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So you done it yet Sonic? You have res delete yeah? We're waiting and require full report and sound bite/vid. No pressure.
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post #9 of 43 (permalink) Old 09-05-2013, 10:47 PM Thread Starter
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Hahaha. I think I'll have a fiddle over the weekend - see how it goes. Yep got the same reso delete you boys have
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post #10 of 43 (permalink) Old 09-05-2013, 11:19 PM
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Hmm, I might have to try this, too. Been bored with how my exhaust sounds at idle/low RPM.

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