Originally Posted by SoCalM5Mang' post='506796' date='Dec 14 2007, 01:56 PM

Couple of last questions:

___Piping---I'm assuming I should try and stick to stock size piping as much as possible to minimize/prevent low end torque loss? (double pipe areas (between the two resonators) is about 2.25" diameter and in the single pipe areas (between the box resonator and the rear muffler) is about 2.9"-3.1" diameter.

___Rear Mufflers---I want to use the Dynomax Super Turbo Muffler due to its chambered technology. Would using this Chambered design hurt low end torque versus a Magnaflow Turbo that is straight thru?

Thanks guys!

So Cal

Originally Posted by SoCalM5Mang' post='506511' date='Dec 13 2007, 06:00 PM

Hi Quy!

Thanks for your help. I wanted to re-hash what we just described as the two potential options for Triple AAA tomorrow?

Two Options:

___AlexF's set up with Center Muffler and Two Rears(paraphrasing Rody?s suggestion from the thread below)(the two Rears being Turbo 4x9 Dynomax-center inlet and side outlet on both sides to uniformly fit best with least hang)
If they are willing to do a center mounted muffler (replacing the center box resonator) then I would go with a Remus because there is less chance of droning. Ideally a 545/550 Remus mounted in that location and split into two straight pipes to the tips would be best. But I don't know if the 545/550 Remus would fit there or not. Looking at AlexFW's picture (which I am reposting here) the space there looks bigger than I had imagined. The oval can that he has mounted there looks similar in size to the Remus 545/550 exhaust.....and that's at the front end, the space looks even wider towards the end of the center section. I bet AAA can make a Remus 545/550 muffler fit where the oem box resonator sits....which is where Alex has put the two double round resonators in this picture.


___Your Set-Up as we discussed: (what I'm 90% likely to do)
From the headers, keep the 2 stock resonators where they are. After them, cut the pipe and add an x-pipe. After the x-pipe, cut (both ends) of the OE boxed resonator and weld it after the x-pipe. Going out of the OE boxed resonator (it's actually 2 straight pipes inside) will be 2 custom piping, each going to each side of the car. Install 4x9 Super Turbo Dynomax (center inlet with side outlet on both left and right side and weld to my custom ACS tips

Does the size of the piping matter with either set-up?

Thanks Guys!

Jay C

Originally Posted by rodybmw' post='506531' date='Dec 13 2007, 06:42 PM

...........


Does anyone know if it matters what order each component goes in? What I mean is that in the oem setup the resonators always come before the muffler.....would it be OK to have it the other way around with the muffler in the middle and the resonators coming AFTER the muffler? So the complete setup being the two tube resonators up front, then a muffler in place of the box resonator in the middle, and then another set of tube resonators at the rear?

Originally Posted by RemusExhaustShop' post='506827' date='Dec 14 2007, 02:28 PM

Piping : That would be correct.

Rear mufflers : Chambered is old school, we don't use it, it restricts performance, a well packaged straight through muffler will do the job.

Originally Posted by vegastrashed' post='506464' date='Dec 13 2007, 03:19 PM

Bimmer32,
You have become quite the resident e60.net exhaust expert.

Originally Posted by Bimmer32' post='496341' date='Nov 19 2007, 08:08 AM

Attack of the droning . . .

The sound is sweet, and the sound level above 2K rpm is about 5 db above the stock sound. BUT, during deceleration (no engine load) or acceleration (straining engine load) around 1500 to 2000 rpm and idle at 750 rpm, the exhaust pressure isn't strong enough to push the air particles fast enough out of the exhaust system. Hence, the "sound waves" bombard the walls of the piping and thereby cause DRONING or resonance. Apparently, my search on other V8 forums identified that this is a "popular" problem with V8s. Additionally, idle sound is notably louder at 750 rpm versus 500 rpm.

Originally Posted by vegastrashed' post='507020' date='Dec 15 2007, 02:06 AM

On my E63, I just recently got a Renntech exhaust put in, removal of the secondary cats/stock crossover and resonator replaced with x-pipe, and stock air filter replaced with AFE air filter. I'm encountering the droning problem that Bimmer32 mentions which I've highlighted in red. Between 1500 and 2000 rpm, the droning is very prevalent but at over 2500 - 7000 rpm, it's music to my ears. I'm think of putting back the resonator to remove the droning. For those who are thinking did the x-pipe help with the droning, yes it did. Before the x-pipe was installed the droning was loud. Now, with the x-pipe installed, it reduced but didn't eliminate the droning. Also, the x-pipe gave me the exhaust tone/pitch I've been wanting. It now sounds like my 545i with the RDSport quad exhaust except it's much louder and of course the droning.