Before building mine, I researched how others built their exhaust systems on here. I think it paid off. Mine is 3 inch all the way back, no cats, with a Magnaflow MPE-11249 4x9x18 straight through muffler where the cats were and a Summit Racing 633001 4x9x14 straight through offset muffler at the rear. I put a 3 to dual 3 inch tip for a factory appearance. It is quiet. Maybe just a tad louder than factory M3, but it's been six months since my car was running so it's hard for me to compare. Anyway, very happy with it. And the tone is deep.
Idle clip. I'll post a clip revving soon. https://www.youtube.com/watch?v=B-61s_DA3Gw
Edit: Rev clip. Not much louder than idle. https://www.youtube.com/watch?v=SuRMFlXc_Z8
Last edited by h82crash; 11-16-2020 at 06:11 PM.
Tom
Currently 1995 M3 manual coupe, 1993 325is
Past cars
2003 530i
1998 528i
1995 530i
1988 528e
1988 535i
1987 2.7i
1972 2002
Nice rumble! thanks for the specs on the mufflers!
I need an extra muffler, i'm getting to old for the (SCREAMING EXHAUST NOISES) doing 100km/h on the highway.
Thanks! On the road, inside the car, it's nice. I can hear my stereo. It snowed 6 inches over the past two days, so a delay getting the rev clip. I'll try today as the sun is out and will melt some of this crap. Bummer that I spent all summer working on this thing.
Tom
Currently 1995 M3 manual coupe, 1993 325is
Past cars
2003 530i
1998 528i
1995 530i
1988 528e
1988 535i
1987 2.7i
1972 2002
Sounds very stock like. is the rear silence really a straight thru design? i found the chamber desings to be way more quiet, but of course restrictive.
- - - Updated - - -
and of course great fabrication!
1982 E21 323i
M50B25 Turbo
Borg Warner S362 SX-E
ECU Master Emu
Not apples to apples, but I tried a bunch of mufflers to quiet my SC'ed 540. The largest straight through Magnaflow that I could fit is what worked best for me. Its like 24" long or something like that. It seems that size is what mattered the most for my car to lower the noise. Maybe an equally large chambered would work too, but I did not want the restriction.
98 540i 6, 525 whp, 120 mph 1/4, V3 Si S/C'er @16 psi, W/A I/C, Water/Meth, Supersprint Headers, HJS Cats, 3" Custom Exhaust, UUC Twin Disc, Wavetrac LSD, GC Coil Overs, Monoball TA, AEM FP, Aeromotive FPR, AEM Failsafe AFR/Boost, Style 65's w/275's, M5 Steering Box, Eibach Sways, M3 Shifter, Evans Coolant, 85 Deg Stat, PWM Fan, 10" Subs, B.A. speakers, Grom Aux/BT, Still Rolling as my DD!
Good point. years ago i built a NA 735 E32 with just a single huge straight thru 3" muffler and it was really quiet. added a exhaust cut out valve too run it open headers whenever i want.
1982 E21 323i
M50B25 Turbo
Borg Warner S362 SX-E
ECU Master Emu
Sounds great especially for 3" turbo back! Thanks for posting the clips too.
Sure is purdy
Sleeper status
“If liberty means anything at all, it means the right to tell people what they do not want to hear.”
― George Orwell
Bookmarks