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?
Matte Frozen Grey wrap, Evolve Alpha N and Power Re-map, Black Kidneys, Re-furbed Shadow Chrome Style 65 Wheels, Hayward and Scott Rear Boxes.
I have no carbon footprint, I have a carbon swimming pool!
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!
BMW E39 M5 - 2001 Le Mans Blue
Evolve equal length headers
Evolve high flow 100-cell cats
Evolve centre H pipes
Evolve GT rear exhausts with burnt titanium tips
Evolve AlphaN tune
AP Racing Brakes
Bilstein PSS9 coilovers
Uprated front and rear sway bars
Dinan strut brace
19" LM Reps
Mk 4 DVD sat nav
Last edited by M5 Russ; 23rd February 2012 at 13:42.
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...