22nd February 2012, 08:31
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#1
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Addicted Member (>300 posts)
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Yet another Cheap exhaust mod
Hi guys,i came across a very simple yet glorious sounding exhaust mod while playing around with my car,i cut 4 square openings(about 10cm by 10cm)on all four rear cans and removed the silencer material,then i closed the openings with some mesh wire,the resulting sound is toxic,at startup and idle its very deep and bubbly but as you pick the revs it changes to a high pitched wail.I have headers,decats,oem h-pipe and oem resonator,Picture is shown below.For those of you who have spare oem cans lying around you better try this!
What i want to know is that does this have any negative impact on the Engine,Power and fuel economy?
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22nd February 2012, 09:18
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#2
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M5 Guru (>2000 posts)
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I do have my originals laying about and would love to have tried this a couple of years ago before I got my H&S but didn't feel that hacking away at a car like this to be appropriate!
Still well done for trying it but I dare say there is some back pressure lost by doing that, maybe no worse than straight pipes tho?
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22nd February 2012, 09:36
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#3
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Addicted Member (>300 posts)
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Quote:
Originally Posted by Leezamonkey
Still well done for trying it but I dare say there is some back pressure lost by doing that, maybe no worse than straight pipes tho?
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Thats what im worried about,does that mean negative impact on the engine,coz i wouldnt wanna put my engine at risk,thats why i asked you guys!
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22nd February 2012, 09:41
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#4
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M5 Guru (>2000 posts)
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I'm really not that clever! Just feel that maybe taking the baffles out I the cans opened it up to straight pipe dimensions, and now you have opened them up further, I think its low end power more than anything that it will affect, as I said I'm not that clever ill leave it to someone else to rectify my wrongness!
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22nd February 2012, 11:15
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#5
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M5 Expert (>4000)
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No different than straight pipes. No negative effect on "back pressure" at all.
__________________
2001 Jet Black/Executive Black///M5 ("M CINCO") current mods and accessories:
~ Complete aftermarket stereo system w/Alpine INA-W910/PXA-H701, Rear Camera, Hybrid Audio Technologies L831 speakers
~ UUC V12 clutch kit with segmented kevlar clutch disc
~ Custom crank case ventilation system
~ Buckhead Imports Performance headers and decat pipes
~ Muffler delete with ///M5 - MCINCO etched "Timmay Tips" LOL
~ Dinan 3.45 rear differential
~ Remote oil thermostat/Setrab oil cooler
~ Fabtech-Performance Heat Exchanger
~ (4) Dinan 18x9.5" wheels ~ Stoptech slotted rotors and Centric Posi Quiet Pads
~ BC Racing coil overs (10k/8k) ~ Powerflex thrust arm and inner track control arm bushings ~ Dinan RSB ~ Beastpower sway bar brackets
~ Slimmbones finned rear diffuser, XL fog light covers, trunk spoiler, and front lip spoiler.
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Last edited by timmay77; 22nd February 2012 at 11:15.
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22nd February 2012, 14:19
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#6
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Member, P500 Sport, DSC On (>700)
Join Date: Aug 2011
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How 'bout a video of the sound?
One thing I would do is spray the mesh with grill paint to prevent the rust.
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22nd February 2012, 15:11
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#7
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Addicted Member (>300 posts)
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Quote:
Originally Posted by bcampbe7
How 'bout a video of the sound?
One thing I would do is spray the mesh with grill paint to prevent the rust.
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Ok thanks,will do,its only for the timebeing till i can afford a proper exhaust!Will try to make a video but i only have an iphone not a video cam!
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22nd February 2012, 18:53
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#8
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Addicted Member (>300 posts)
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Cool.
The main reason to go a step further and do straight pipes is for weigh savings (those suckers are heavy) and nicer tips.
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23rd February 2012, 13:39
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#9
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Member, P400 Sport, DSC On (>550)
Join Date: Mar 2008
Location: Kent, UK
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BMW M5 v8
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Pretty certain that would fail the MOT here in the UK as it would allow exhaust fumes into the cabin - rather you than me. Its a low rent mod that has no place on the M5 IMHO
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Last edited by M5 Russ; 23rd February 2012 at 13:42.
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26th February 2012, 18:06
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#10
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M5 Guru (>2000 posts)
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I have to say that years ago I thought about opening up the cans to see what was inside as well...
But, uh, although I might have removed everything - had I done it - - I'm pretty sure I would have then welded them back up/completely closed...
The reason is it is necessary to get the exhaust beyond the rear of the car - so you don't get some of it back inside - and imho - completely closing them keeps the car from looking hacked up so to speak...
I would recommend that you consider a muffler delete - with the tips some board members have used (they have resonators inside the tips) they are also a low cost mod - search and you will find them...
.
Last edited by MarkQC; 26th February 2012 at 18:07.
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