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Thread: Stock exhaust pipe diameter???

  1. #1
    Join Date
    Nov 2004
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    NORCAL (916) (707) (510)
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    1998 aspn E39 540isa

    Stock exhaust pipe diameter???

    Does anyone know what it is on a 1997 528i? I'm trying to purchase two Magnaflow 43000 cats. Magnaflow doesn't know, my exhaust guy doesn't know, and believe it or not my local BMW dealership doesn't know either. I would think its 2.25" but I want to be sure before I buy what I need.

    Thanks, Abe

  2. #2
    Join Date
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    98 740iL, 01 Suzuki TL10
    Tell the exhuast guy to put it on the lift and use a tape measure or a ruler....problem solved.
    650hp 10 X5///M5
    PERFORMANCE:JB4 w/ meth, stage 2 tune, wrapped downpipes, custom intake
    INTERIOR:AVIN 10.25" screen, Blackvue 550 dashcam, 7" tablet for JB4 logging
    EXTERIOR:Niche staggered 20's or AC Forged staggered 22's, H&R 2" suspension, LED AE, CF front splitter
    325hp 98 BMW 740iL6
    PERFORMANCE:///M5 6spd swap, iron sleeves, L/W Teflon coated & silicone impregnated pistons, Sealed Power rings, 3 angle valvejob, P&P head, perf cams, electric fan, CF intake tube w/aluminium heatshield/wrapped MAF tubing, Magnaflow 14816'd, Eaton M112 in-work
    INTERIOR:Android Dynavin, hardwired V1 above rearview, 12" RE Audio DVC sub, MTX 81000D monoblock, CF silver trim, 5% tint
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    190hp 97 328ci
    PERFORMANCE:Single mass flywheel, ///M3 clutch
    EXTERIOR:Z4///M staggered 18's, rolled fenders, tinted markers

  3. #3
    Join Date
    Nov 2005
    Location
    Fort Wayne, IN
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    Bmw 540i/6; 530i/5
    i read in a thread its 2.75....dont quote me on that...

    FS:NEW_BF_Goodrich_245/35/17

  4. #4
    Join Date
    Dec 2004
    Location
    Mill Creek, WA
    Posts
    4,028
    My Cars
    98 740iL, 01 Suzuki TL10
    For a V8, not the I6.
    650hp 10 X5///M5
    PERFORMANCE:JB4 w/ meth, stage 2 tune, wrapped downpipes, custom intake
    INTERIOR:AVIN 10.25" screen, Blackvue 550 dashcam, 7" tablet for JB4 logging
    EXTERIOR:Niche staggered 20's or AC Forged staggered 22's, H&R 2" suspension, LED AE, CF front splitter
    325hp 98 BMW 740iL6
    PERFORMANCE:///M5 6spd swap, iron sleeves, L/W Teflon coated & silicone impregnated pistons, Sealed Power rings, 3 angle valvejob, P&P head, perf cams, electric fan, CF intake tube w/aluminium heatshield/wrapped MAF tubing, Magnaflow 14816'd, Eaton M112 in-work
    INTERIOR:Android Dynavin, hardwired V1 above rearview, 12" RE Audio DVC sub, MTX 81000D monoblock, CF silver trim, 5% tint
    EXTERIOR:///MPar staggered 19's, H&R Stage 2/Bilstein HD, custom notched bumper, Shadowline trim, 750iL brakes w/ Axxis pads
    190hp 97 328ci
    PERFORMANCE:Single mass flywheel, ///M3 clutch
    EXTERIOR:Z4///M staggered 18's, rolled fenders, tinted markers

  5. #5
    Join Date
    Nov 2004
    Location
    NORCAL (916) (707) (510)
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    My Cars
    1998 aspn E39 540isa
    Quote Originally Posted by m5james View Post
    Tell the exhuast guy to put it on the lift and use a tape measure or a ruler....problem solved.
    The exhaust shop is about 80 miles (I'm getting a good deal) from my house. I would rather not go there twice. I'm gonna have the shop I use mearsure it for me.

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