Is anyone just running the valved rear section only (rest OEM)? @iliveoncaffiene that drone sounds intense!

 

It's barely livable, and I'd prefer to not have to drastically modify my driving (having to do 5th gear or 2nd gear at 45mph).
It definitely seems to be cabin based and I'm hoping the posts above were right about the sound symposer.

It really sucks because outside of that, the sound is exactly what I want

 

Hi Frosty,
- i drove it today, no CEL light. Only been 2 days and 100ish miles, but so far so good.
- i ordered the soul spacers, and they fit, but the shop called me and wanted to order different spacers. ordered 3 different spacers to try. i just looked at on the pickup notes and it says mini cat straight o2 spacer. i can find out which ones.
- gas smell, i dont notice any. however im not the best person to ask. my daily driver subaru of 16ish years has no cat unresonated straight pipe, so my sense of smell for gas fumes has been desensitized, haha. My wife however told me today she said my car smells like gas now, i just shrugged, i really cant detect anything and i have a good sense of smell.
- i took my 7 year old for a ride today. he loved it, but i would strongly caution driving young ones without ear plugs. It will be a requirement for my kids.
- as caffeine said, there is drone in that range. it is intense,but just in that range, so you have to be prepared for it. it doesnt bother me though, but again everyone is different. i listen to a high pitched drill and ultrasonics all day long so i might be desensitized. switch up the gear and throttle and its gone. i do have very good hearing.
- i absolutely love the setup. well done guys!

 

Would love to know what cats are they exactly? From ebay? Because the ones i used from Soul triggered after driving about 50km after i WOT

 

Hi always, I will find out today. I haven't done WOT yet myself...but nice moderate throttle...but the shop owner took it for a ride and tested everything and he couldn't trigger it either and I made sure he pushed it a bit.

 

So there is 2 o2 sensors on each headers if I’m seeing correctly on the picture?

 

​​​​​​ On the OEM headers one is pre catalytic converter, one is after (or inside). Which is why in the picture only 1 has a spacer

 

The first one is the one that monitors the Air/Fuel ration (A/F)...it's the one with the blue cable.
The second one is the post cat O2 that monitors catalytic efficiency.
You could live without the second one as long as you don't mind a constant CEL.
You could code out the CEL for the secondary O2 or try the Armytrix Armynator dongle...have one but never try it.
O2 spacers are a hit or miss...meaning it takes time for the ECU to do test and gather readings before the CEL appears.

 

Someone is about to get their Competition Headers...



-Mike

 

that is a work of art. 🤤

 

I have a 718 Spyder and recently installed Soul's street valved exhaust with the overaxle pipes. I am still running the OE valve control. The sound of the exhaust is a big improvement over the stock set-up and the installation was very straight forward due to the very precise fitment of the parts. Parts quality is first rate. The one drawback was noticeable drone between 2000-2500 RPM. Above and below that, no drone, just better sound quality than OE. Once the valve controller opens things up (app. 3800 RPM), the system just rips in a very melodious way. However, having read about the potential contribution of the intake sound mechanism to the drone issue, I decided to see what disconnecting it would do. Rather than tear out the entire mechanism and have to plug the subsequent holes, I decided to simply plug up the sound tube where it enters the passenger compartment. All you have to do is disconnect the sound tube where it meets the right angle plastic tube fitting that attaches to the firewall, then stuff that right angle fitting with rolled up, high density, closed cell foam. I used a piece of 1/2 inch foam rolled into a tube shape and then stuffed inside the plastic tube. Just make sure it goes in deep enough to allow the sound tube hose to reconnect to the plastic tube when you are done. When finished, everything looks OE. To be sure I eliminated any contribution the sound tube was making to the drone issue, I also plugged the vacuum hose that operates the sound tube's flapper valve next to the intake box. This is a small curved rubber hose that connects the vacuum line to the flapper valve and is easy to access since it is not buried under other engine parts. The rubber hose is asymmetrical in that one end has a smaller inside diameter than the other. The small inside diameter end goes to the flapper valve and the larger inside diameter end of the hose goes to the vacuum line. If you get a 1/4" diameter allen head threaded plug (1/2 inch long or less), you can thread it into the large diameter end of the hose (barely touches) until it gets to the middle of the hose where it will dig in tight to the smaller diameter portion of the hose, creating a tight fit with no chance of vacuum leakage. Using this larger size threaded plug instead of a smaller diameter one not only provides a leak proof fit but also insures that there is no way the plug could ever be sucked back into the vacuum system, since it is much larger than the inside diameter of the vacuum line. Make sure you thread the fitting in far enough to leave the full length of the larger end of the hose available to properly fit over the vacuum line which has two raised edges (ridges) that should be covered by the hose when pressed on. Again, final result looks totally OE and since the operation of the flapper valve is vacuum controlled and not monitored by the ECU, no CEL possible. Now for the really good news: Virtually no drone at any RPM! A tiny bit is still audible between 2-2500 RPM but you really have to listen for it now as opposed to being annoyed by it in the past. For me, the results were almost unbelievable, the difference was that great. I understand that Soul designed this exhaust system to have the least drone with the valve control open all the time and that is the way they recommend it be used, but if you want to keep your valve control OE, or want to eliminate as much drone as possible under any circumstances (I'm sure it would work with the valves open, too), I can highly recommend this approach.

 

I have Akra OAP installed and Soul valved rear section on order along with a CG controller, so interested in this.

Don't suppose you took some pics/video of this modification?? Would be great to have some additional instructions.

 

I have mentioned many times that I thought I heard drone that seemed to emanate from behind the passenger seat...

Couldn't you pull back the carpet in the cabin and simply stuff the high-density foam in from that side?

 

This guys just put a sock in it: https://rennlist.com/forums/718-gts-...l#post17155325

As an aside, where's the easiest/cheapest place online to get high density foam?

 

thats was this guy. Lol
can someone please post a pic of the vacuum line contraption described above going to the airbox flap? Please? I may need to get back in the engine bay