FWIW, 2 weeks with this installed and so far so good. And I have been beating on it quite a bit to get tuned. No increase in noise, no rattling, etc. Will keep posted on significant milestones (1 month, 6 month, etc) just incase it entices anyone to consider it.

I just wonder what effect it has on performance (if any)

I hope the lighter single pipe offsets the drop in horsepower. Subscribed. Interested to hear the long term results. I want to make the jump to a single but the noise limits in my area are strictly enforced.

If there was a loss in power, it is minute enough for me not to feel it.

Update for those still interested:

Been about 2 months now since I installed the auger insert, and things are still looking good!

Mind you that I haven't been babying this car either as I have been doing some tuning so the car has had plenty of time of sustained RPM driving even at 8000rpm.

The car is still quiet, no strange things that have happened, no performance issues, no sluggish feel.

The only "issue" that I can mention is that now that it is really cold out (if the car sits outside at work when it is like 18F here) i can hear a tiny rattling. This is probably because one of the auger blades is rattling against he exhaust pipe on the inside. The noise goes away after a minute or so once the exhaust system starts heating up.

Yep, figured as much. Right now I dont mind the rattling against the inner wall of the exhaust pipe since it goes away relatively quickly (and really only happens on very cold mornings).

As long as I dont go and start shooting out auger blades out of my exhaust i'll be happy lol.

And just to reconfirm for those who are just reading about this for the first time... this isn't an alternative for a quality midpipe, but a low cost solution for those who are dealing with a loud cat-back and are considering welding in an additional resonator.

Paimon did you start out with the bhr midpipe or did you have another one before that? Did you get any buzzing or much louder exhaust noise around 3.5-4.5k rpm with the bhr pipe, prior to installing all the stuff here? Also you went with the race roots single right?

I really don't mind how loud my exhaust is except between 3.5-4.5k because I spend so much time there in city driving. As I said in the other thread I am thinking of replacing one of my AP resonators with a bhr one and your answers to the above questions should help me know if it is worth my time.

I went from OEM to BHR. The only buzzing I really got was when I first installed hte pipe and that is only because I didn't have my midpipe properly aligned which cauesd me to have a very slight gap at the forward flange. What i mean is that I found on the S2, because of the very slight differences in the path of the exhaust, it takes some extra care to tighten the bolts up evenly.

What you are experiencing is probably the metal pinging that is characteristic of some straight through resonators (which i believe the AP has).

And yes, I have the RR single exit.

Lol very true ... hopefully no one is behind me though should it happen or they iwll be going home with a souvenir

Yeah it is a straight through resonator. I knew when I bought it that it was one of the cheaper options and it has sounded like that from day one. It might have gotten worse over time but I really couldn't tell. I had a hard time getting my midpipe to seal at the header>midpipe spot I had to go buy one of those carbon crush gaskets from race roots because nothing else would seal properly.

Update.

Decided to remove the rear portion of my exhaust to check on the auger insert. All looking fine so far! No rattle, no pinging, no tinning, nothing. From a naked eye I dont see any massive stress fractures in the welds.

nice

Just added an auger insert and 3" high flow cat to my agency power exhaust. I can now run with the 3" mid-pipe pleasantly. Before this I had to go to the stock midpipe because the drone at cruise was unbearable.
Thanks Paimon!

Glad others are benefitting from this. FWIW I still have no issue with mine and this after a ton of autocross sessions and a lot of sustained low to high rpms from tuning :)

Let the fear-mongers go pound dirt ....

It will be interesting to see a before and after dyno on this product. I looked into it a few years ago however I was not convinced at the time.

However, it sounds encouraging from what I am reading here.

I have heard of a really loud car dampened with J pipe/ side resonators. It uses the same principles as a resonance chamber installed in our intake system. This noise cancelling method has zero restrictions.

Yep, J pipe configurations are rather common for the 350/370 guys. Actually the Fujitsubo exhaust (or the obx knockoff version) uses a J pipe as well. Haven't heard a rotary up close with one.

As far as dyno goes, I would like to see the results too (unfortunately I just dont have the definitive need right now to dyno the car), but as far as 'seat of the pants' feel goes, i'd really have to say I 'feel' no loss. Harlan keep me honest here if you felt otherwise.

I didn't notice any change, but my teeth were rattling before when I opened up the throttle, so I wasn't keen on punching it.

I think the pipe is big enough that a little restriction doesn't matter.

How's this holding up? Are you still using this setup?

Totally missed this question. Still holding up, not a single problem after 2 seasons of autocross, and generally driving the car the way its meant to be driven.

The only "thing" i have noticed is some discoloration at the last bend of the exhaust, but that makes sense as the slight restriction along with the bend traps a bit more heat than normal. I'll have to take a picture to show so that we can compare to others who have a HKS/RR style single exit.

That's awesome to know. I previously had an RR exhaust a several years ago and got rid of it for several various reasons, but the time has come and I just ordered an HKS single exit again. If it ends up being up too much for my wife(or me even)then I will definitely be pursuing the auger silencer route.

Odd sounds quieter than my dual with a rev 2 mid pipe...BTW what kind of intake are you running ive got a weapon r one and I really wanna get that sound of the rotors winding back

AEM w/ the last bend chopped.

Thanks for this one. I ended up with a turbo XS. And, they no longer have silencers for it. I had an incredibly loud span from about 1,800 to 2,400 RPM. I do a lot of 40 mph cruising at this speed. It was really bad, like shake windows bad.


I bought one of the augers from summit, trimmed the pipe ends, and installed it. The bad range went away, most of the drone is gone, car runs find, did not seem to hurt performance. With eh XS over stock, I got a lot of low end power. Like drive around in 6th gear at 25 mph low end power. Installing this did not change that.


Install procedure:
In a straight piece of pipe, see if it fits. If it does, you win.

If not, look and see if there is an inside seam bead in the exhaust pipe. If there is, notch the spirals to allow for it. This will save in trimming. Does it fit now?


If not, a grinder is your friend. put first coil in pipe, see if you can straighten it to install the second spiral. If not, you need to grind some of the first spiral. Wiggle it. The pivot points that it wiggles around are the high points, grind them a bit and try again. Repeat.


Once I got the second one lined up, the rest of it went in easily. I tapped it in with a board.


again, highly recommended.

Glad you had similar results. Mine is still going strong !