Bimmer32

Actually, resonators are tuned based on the design of the headers. AMG probably spent $$$ on a header design, then design the resonators to tune down the high frequencies and some low frequencies while designing the mufflers to muffle the majority of low frequencies. If it's a free flow muffler design, you'll hear most of the low frequencies out the tailpipe. If you noticed cars with open headers (supermod camero and mustangs), the sound is a bit medium low and high; sort of like someone gargling.

Cats can act a sound suppressor too. Resonators will reduce the droning while mufflers are the ultimate component to eliminate the drone. If you have free flow cats, its effect on sound level/frequencies is like resonators. I suspect your Renntech muffler are much more free flowing than the stock AMG.

Were there any "x" ing on the stock system? If so, you can put back your cats (which probably does the same degree as your x-pipe with regards to sound level and frequencies reduce. It's probably more of an emission concern), reinstall your resonators (because they are built to tune down/out the sound created by your custom headers) and leave the Renntech mufflers in place. The muscle car sound is probably coming from the stock AMG muffler because that's the component in your setup that are most effective with sound manipulation.

If you still insist on the bullet resonators, then go for it. But keep in mind that eventhough it works on a V10, it may not do the same on a larger displacement v8.

The header, cats, resonators, and mufflers all do their job to give you the sound note, but the mufflers have the most and last "say." From behind the headers, the more free flow the component, the less effect it has on altering the sound level and frequencies. Keep in mind that resonators "tune" sound frequencies while muffler "muffle" sound. Cats usually act like mufflers, but their main goal is curbing emission.

vegastrashed

I had a feeling the secondary cats acted like a sort of suppressant in addition to eliminating the noxious gases. My Renntech are absolute more free flow than the stock AMG exhaust.

As a matter of fact there is a stock crossover right before the secondary cats as you can see in this pic.


Here is the after pic and the custom x-pipe by AAA exhaust in LA. If I end up putting back the secondary cats and resonators that would mean I wasted $$ on my beautiful custom x-pipe. I don't want to do that.




I had Darwin, the owner and Barrett, the master mechanic at Sonic go for a ride along in my car tonight and they both mentioned the drone isn't that bad. But, most important of all, my g/f hasn't mentioned anything about the drone. Hmm... I think my ears are too sensitive or picky. I was too spoiled by the RDSport exhaust.

I'm going to live with my current setup for now.

Bimmer32

That's a nice looking x-pipe and clean setup throughout. The h-pipe is part cause of your muscle car sound, by the way and your chambered AMG muffler added to the muscle car sound too. The Mustang guys can confirm that h-pipe are boomy while x-pipe is more Nascar like.

vegastrashed

I just wanted to point out for some people that read this thread and see a Mercedes Benz E63 AMG stock exhaust being discussed, the 6.3 AMG exhaust has similarities to the e60 M5 exhaust: two primary cats, two secondary cats, and resonator. The difference is the M5 has four mufflers whereas the E63 has two mufflers. Most M5 owners replace the stock four muffler setup with a two muffler setup like the E63. So, all the problems I've had with droning I can share with the BMW guys since the exhaust setup are so alike.

rodybmw

Well, my Remus does have some droning (not too much). Before buying mine I sat in Peter's 550 with the same Remus quads and I didn't hear/feel any droning at all, but I was in there for less than 3 minutes just going around the block. So maybe the 550's resonators (which have different part numbers than the 545's) do a better job of controlling droning. I plan on meeting Peter again in a couple of weeks to hear how his AFE sounds in conjunction with the Remus. I'll pay closer attention to see if there is any droning and whether it's at the same level as my 545.

I don't have a camcorder at the moment (my DVD camcorder is broken and I'm waiting to buy a flash card version that I saw at CES).....so I can't post a clip until April or so, when that camera comes out. However, I am copying and pasting below my opinion that I posted in my X-Pipe thread about the droning in your clips vs. my Remus:

I finally listened to your clips on my work computer. I would have to say that the Remus quad's droning is less than both the straight-through exhaust and the stuffed muffler. While the droning is not a huge deal lower than the stuffed muffler, it's still noticeably lower. Of coarse, I can't be a 100% accurate in my estimation since it does depend (to a degree) on the volume setting of the speakers when I listen to the clips.

It's interesting that when I listened to your clips on the tiny speakers of my laptop there was no droning at all, but on my work computer with the sub woofer I could both hear the droning and feel the vibrations of the droning as if I were sitting in the car. This just confirms that droning is a low frequency issue and the laptop's speakers are not able to produce low frequencies.

Bimmer32

90 hz frequency is your drone; when it's loud enough, it resonates.

Bimmer32

VT, you're in denial.

Here's what my wife said about my car when I hang around the drone rpm:

"The sound makes this car look cheap . . . like it was in a wreck or something."

My response: "You don't know what racing exhaust is about."

Her response: "I don't care, it sounds cheap to me."

badman25

BP! This sounds like the perfect setup! I've been wanting to get quads for a few months now, but from reading all of these postings on quad exhaust droning problems, I'm worried that I'd end up reverting back to stock. Being able to turn the quad on and off through this electronic cut off would be perfect.

Has anyone used one of these QTP cut offs before. Would exhaust shops have experience with these? I'm going to call around and see what I find out, but any more details would be helful.

newbiebimmer

hey guys, sorry I haven't been around.

My remus on my 550 is awesome. There is zero droning.. and it sounds damn good.

I'm moving back to the bay area in 2 weeks so Rody, socal, vegas we should get together next week as I want to hear your exhaust systems.

I'm in beverly hills.. who wants to do a small meet?

rodybmw

That would be great as I would like to hear yours again. We have the same exhaust yet mine has some droning and it would be great if we could try them back to back and compare. I'm also interested in hearing your AFE.