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M2 exhaust options


m-racer

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I drove the new (to me) M2 800 miles yesterday from Fl. to Va. Ran like a champ, but the exhaust is obnoxiously loud. It is evo headers to a Borla midsection to a Magnaflow rear can. My last s14 car had factory headers to a custom midsection/connector to a 2002 turbo exhaust. That seems like good option, but I thought I might start by replacing the Magnaflow muffler with a Supersprint to start. Any ideas would be appreciated. I have had track cars that weren't this loud. Thanks, Tim

More former BMW's than it is possible to list.

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turbo exhaust is nice and quiet but youll choke that thing with it. what size piping is on that car. i thought it was 3". im running 2.5 with a generic glasspack for a resonator and a straight thru magnaflow out back and it sounds nice. louder than my turbo exhaust on my 69 but not obnoxious and no droning at speed

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It is 3". I am just trying to tone it down a bit. I wouldn't be surprised if the packing is shot in the magnaflow. I am pretty sure I can find a Supersprint can to replace it with. I had a Borla on the E30 M3, replaced it with a SS and it took the drone down considerably. I am going to drive it up in the mountains at 02berfest in a couple of weeks and will see how I am feeling about it then. Could just be that I dove it 800 mis in bad weather with the windows up that is giving me the impression that I can't live with it. Don't want to choke it up and slow it down. Took quite a while to get the throttle bodies squared away, the fuel map set up, and final tune done. Good news is, loud or not, it runs great.

More former BMW's than it is possible to list.

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Yes, I remember the sound of that car. I drove behind it for 20 minutes or so through downtown San Francisco en route to the Swap and Show in May. If the string of a dozen '02s weren't enough to get people's heads to turn, that exhaust did the trick!!

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2.5" is too small for a cammed 2.5 S14.

2.75" might be ok but I would suggest 3". Mine is still slightly choked at 2.5".

A pair of short center resonators (and a rear muffler) should minimize the highway drone. Mine has just a long center resonator and rear section, and John the German on s14power.com recommends 2 center resonators to cancel the resonance for a single pipe exhaust.

Cheers,

Ray

3" is a bit large for na, 2.5 would probably be better suited imho

Ray

Stop reading this! Don't you have anything better to do?? :P
Two running things. Two broken things.

 

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2.5" is too small for a cammed 2.5 S14.

2.75" might be ok but I would suggest 3". Mine is still slightly choked at 2.5".

A pair of short center resonators (and a rear muffler) should minimize the highway drone. Mine has just a long center resonator and rear section, and John the German on s14power.com recommends 2 center resonators to cancel the resonance for a single pipe exhaust.

Cheers,

Ray

3" is a bit large for na, 2.5 would probably be better suited imho
Ray, That makes sense. I have a dual resonator Supersprint system on the Euro M5 and it is very civilized. Are you still coming to Va.? Tim

More former BMW's than it is possible to list.

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Yep, but I'll be late. ;-)

Maybe in December, I think.

I went to the SoCal show today, but not heading east on this trip.

Cheers,

Ray

Ray

Stop reading this! Don't you have anything better to do?? :P
Two running things. Two broken things.

 

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