Exhaust is getting on my nerves...

[AMG3.2]

Hey all, So as some of you know, I've had my exhaust completely redone to the C55 look. - Quad Tips I have a center muffler, and cats still in place. At first I really liked the sound. Now, it's starting to get on my nerves. I want to quiet it down a bit as I am getting horrible drone around 2k - 3k RPM's. Driving on the freeway is even annoying sometimes. Here is the question: What should my plan of action be? Add resonators? Another muffler? Regarding adding another muffler, is it alright to have two mufflers inline of each other? Like one after another? I lost some back-pressure anyways and lost a tiny amount of low end torque anyways so I figure a little more back pressure will not hurt. What do you guys think? If you guys need pics of my current exhaust setup for reference let me know! Thanks a bunch

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[michael kuzni]

April fools there's no such thing as too loud of an AMG!

but yes post some pics of what it looks like under your car leading up to the tips. i'll sell you my resonator for $30 if you need it, it's sitting under my bed.

[MBfinatic]

Is it really loud?? Post a sound clip!

[saer1one]

I would say add a resonator.. If it does not fit inline then my second option would be to research for a more quieter muffler..

[loudandheard]

Try something like this http://www.custom-performance.net/pr...idproduct=1184

[tw2]

So just to clarify, you no longer have the rear muffler just before the exhaust tips? If so this will make the most difference since it looks like a non-straight through baffled design. I would find stock mufflers.

I have tried barrel/bullet style resonators on different cars before. Even using multiple in a row, some filled with glass packing, some with louvered indents, everything, they seem to make very little difference at all. I wasted a lot of money going off a lot of bad information trying to make a 3" exhaust for my toyota, they have certain requirements to make them legal here. I will never make these mistakes again.

[arekux]

i added two glasspack mufflers on each side there is room...

[chris.bachman]

About a year ago I moved to a dual exhaust setup with a center position muffler/x-pipe. I've talked to the shop that did it and they said resonators won't help because the sound is coming from the muffler itself being centrally located under the car. It vibrates and transfers into the cabin directly above it and the sound is then amplified. You've got a couple options, go back to stock, try and relocate the muffler back further (not very easy) or switch the spare tire well to a C55 center setup and run dual mufflers in the rear of the car.

I've got the exact same drone, I guess I'm just used to it now. That or I keep my music loud enough to not notice. Whatever the case, it sounds glorious at WOT and I can't force myself to get rid of it for that reason alone.

[AMG3.2]

Hmm, would adding another muffler reduce noise or drone? If I added another muffler inline with the current muffler? Would I run into back pressure issues? Arekux, have the resonators made any difference?

Thanks for the help guys!

[2MCHCAR]

Subscribed. I currently run a Borla muffler and I have a some drone at the 2K-3K RPMs. I'm going to add in some bullet mufflers at the back (before the tips) and see if that helps.

[RedStripe]

glasspack (s) the longer the better.

[_AMG_]

What kind of mufflers are you using?
Can you post some pics of your exhaust?

[PTE]

I took the time to view what I think you have for a exhaust system. Let see. you have a Magnaflow X-pipe muffler up in the drives shaft well , Then a left & Right side pipes going under the rear suspension leading to the left & right side trunk well area, Where mufflers would normally go? But no mufflers. If you try to add in Bullet type glass packs or small Header resonators. It will not help much at all. In Fact anything under 9' in lenght will no work Period ! Stay away from Vibrant , It is good stuff , but designed for 4 cylinder , exhaust and really doesn't offer enough baffleing to kill the drone. So you will need a baffled or two pass type muffler to use in conjuntion with the Magnaflow. Look into Stainless Works In Ohio. or Spin-Tech in Cali.
Cheers _PTEngineering

[Kevwood]

I had massive drone in my system when I had it redone, I ended up adding one additional Magnaflow (straight through, no baffles) and it mellowed everything right out. Very happy with what I have now.

Good luck.

[AMG3.2]

Originally Posted by PTE

I took the time to view what I think you have for a exhaust system. Let see. you have a Magnaflow X-pipe muffler up in the drives shaft well , Then a left & Right side pipes going under the rear suspension leading to the left & right side trunk well area, Where mufflers would normally go? But no mufflers. If you try to add in Bullet type glass packs or small Header resonators. It will not help much at all. In Fact anything under 9' in lenght will no work Period ! Stay away from Vibrant , It is good stuff , but designed for 4 cylinder , exhaust and really doesn't offer enough baffleing to kill the drone. So you will need a baffled or two pass type muffler to use in conjuntion with the Magnaflow. Look into Stainless Works In Ohio. or Spin-Tech in Cali.
Cheers _PTEngineering

YES! Exactly, thank you for taking the time to help me out. I still haven't done anything about the exhaust but I'll look into the baffled muffler as suggested above.

[AMGC]

pics?

[PTE]

I can only assume you need pics of the exhaust components I'm working with
Cheers _PTEngineering

[FrankW]

1. move the muffler to where the OE muffler is. redo the pipe at the end (the way Roland did it) and add a resonator/put the stock resonator back on.

or

2. add two small resonator before the exhaust tips. however this doesn't guarantee you to reduce the drone.


i'm assuming you have a magnaflow or borla muffler in the middle where the resonator was.

[PTE]

Good Questions Frank:
I removed those little header Mufflers , Installed the longer Stainless Works Resonator tubes. I put Spin-Tech Mufflers at the rear . I was going for max flow with least restriction. Very Hard to do without getting a LOUD DRONE. I had a magnaflow X-pipe muffler up in the driveshaft well ,It was a real tight fit. And on a Lowered car (1.5" or more ) it would scrape even on mild road Crown or driveways , Even crossing / passing to the other lanes on the Blue ridge PKY at hi speeds , when the air pressure is pushing down the car! So I removed it & installed a X-pipe , then the Stainless Work Tubes , to work with the Spin - Tech rear mufflers
Cheers _PTEngineering

[hyperion667]

[Lenin]

Originally Posted by PTE

Good Questions Frank:
I removed those little header Mufflers , Installed the longer Stainless Works Resonator tubes. I put Spin-Tech Mufflers at the rear . I was going for max flow with least restriction. Very Hard to do without getting a LOUD DRONE. I had a magnaflow X-pipe muffler up in the driveshaft well ,It was a real tight fit. And on a Lowered car (1.5" or more ) it would scrape even on mild road Crown or driveways , Even crossing / passing to the other lanes on the Blue ridge PKY at hi speeds , when the air pressure is pushing down the car! So I removed it & installed a X-pipe , then the Stainless Work Tubes , to work with the Spin - Tech rear mufflers
Cheers _PTEngineering

Pat, for the Stainless Works tubes, is this what you used: http://www.stainlessworks.net/produc...ll-finish.html I need to do something too. The last ticket I got, the cop told me that he first heard me and then saw my car.

[PTE]

OK lets see if I can get this right
You will need a pair of ST-252425 M
That breaks down ST = Smooth Tube / 25 = 2.5" inlet / 24 = 24' total overall length / 25 = 2.5' outlet / M = Mill finish. P = polish finish This tube has 20" of cheese grate Baffle in a spiral cut & Stainless steel Packing
Call Stainless Works 800-878-3635, Ask for Jason, Drop My Name get the mufflers with 2.5" ID on both ends , A good muffler shop can open up & trim the inlets & outlets. Attached is a Order sheet Your should look close to this one
Cheers _PTEngineering

[KA8]

Don't add a resonator! Do what I did to my Z. I have 3'' free flowing system mated to 2.5'' catback. Sound great plus droning on hwy. I considered many options, venturi tubes, resonators etc... but they rarely do anything to quiet down the drone.

Go to a muffler shop and get Side Branch Resonator for your system. It's a CAPPED at the end, same diameter piping branching out of your current exhaust pipe. Since it's capped no air flow goes through the pipe causing no performance loss but sound waves will go and bounce back canceling out certain frequency. Whatever frequency you want to cancel out depends on diameter and length. Honda S2000 has this from factory, many high end bimmer aftermaket exhaust system have this as well. If nobody sells this for your car, then you can experiment/tune your own at a muffler shop. Before mine was done I had bad drone at 55-70mph. I had to speed up and maitain 72mph+ to reach a quiet cabin but being in LA/OC area that's not always possible. I had this done 3 months ago and I can enjoy quiet ride on fwys, it's DEAD/stock quiet at cruising speeds while maintaining 'loud' exhaust system. Cost me $130. Others usually have piping go parallel to exhaust pipe but Z's are cramped so I had to make it bend out like that but you get the idea.

There are many sources online. Just google side branch resonator. I've seen this on MK3 supras, BMW 335, M3's, tundras, etc...