bmw e36 318is best way to cut a hole in back bumper for a exhaust????

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  1. bmw e36 318is best way to cut a hole in back bumper for a exhaust???? 
    #1
    Dr of BMW
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    kevinbmw318is's Car Details
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    hiya all, my mate is wanting to cut his normal e36 back bumper as he has a twin exhaust and hes moving it up into the bumper more, hes wanting a good job but not wanting to pay ££££ so can anyone say any tools that will be good at cutting a half circle thanks
    stanced vert OEM BABY! when verts go mad
     
     

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    #2
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    Tim323's Car Details
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    Well I've never done this before but I would probably do this -

    1. Mask up a medium size area above the exhaust or round the existing exhaust recess.
    2. Line the new exhaust up with the bottom of the bumper and roughly mark the centre.
    3. Measure both exhaust tips (across both) to the outer radius's and half the figure.
    4. With a rule measure and mark the correct distance.
    5. Then measure the height of the tips and again mark the desired dimension on the masked area.
    6. Mark out the top and sides so it makes a rectangle.
    7. Then using something like this - http://www.sourcingmap.com/6mm-pilot...aign=ukfroogle I would line the radius of the tool up on the top and side of the rectangle and cut away.
    8. Then using a jigsaw cut the excess from the top of the rectangle.
    9. Using a large smooth file, draw file the excess off to leave a smooth finish.

    Like I say, never done it before and didn't exactly know what you wanted but that's that I'd do
     
     

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    kevinbmw318is (12-09-2011)

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    #3
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    kevinbmw318is's Car Details
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    thanks mate sounds good to me
    stanced vert OEM BABY! when verts go mad
     
     

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    Disco Stu's Car Details
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    I basically done the above with my old 306 but didn't have a jigsaw, so heated up a stanley knife red hot and used that to cut the bumper.

    Don't do what I done with my rear diffuser though..I sat on the floor whilst slicing a bit off downwards and ended up with an inch deep gaping hole in my leg. 3 hours from my flight to Spain! To say the Misses wasn't pleased is an understatment...I still can't feel properly in that leg over 12 months on.. doh!

    Let me know if you get them driveshafts off Kevin.
     
     

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    #5
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    mk4sg4eva's Car Details
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    honestly the best way let it sit up tight to it go for a long drive and it will melt the plastic to the exhaust shape then trim off the excess i found this out by accident with my single 4" jap pipe which sat quite tight to the bumper after a long drive it melted its way into the bumper where it wanted to sit and it was snug as mate,thats my pinion anyway which u may think sounds rough but it worked for me haha
     
     

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    #6
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    hi all done it now, used tims way
    stanced vert OEM BABY! when verts go mad
     
     

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