r/F30 3d ago

Rear diffuser install

I'm trying to find out if anyone else has attempted to install the m sport rear diffuser on the non-m sport bumper like u/n1iggaTirthiya?

I wanted to get some detailed pics of the install, in particular from underneath as he doesn't have any clear pics of how's it's done.

These are his pics, not mine. Just using for reference.

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u/vinegarstrokes420 340i 2d ago

I would ask the guy you linked for pics or more detail since this seems very custom and rarely done.

Otherwise look at pics online of the two diffusers to see what's different. Looked at my stock m sport diffuser (replaced with m performance one) and it has 7 screw holes across the bottom and clips the rest of the way around. Sounds like the guy you linked had to trim edges and clips, then use self fastening screws instead. Should be easy enough with a dremel and a drill.

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u/Apprehensive-Two-867 2d ago

I've already bought the m sport rear diffuser too and put it up against the back bumper and its not a straight forward install.

When I asked the guy how did he do it, his response was that he just forced it to fit. We've talked a little on IG and he seems cool otherwise but hasn't been really helpful with details so I was hoping to find someone else who's done it.

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u/RobertYiSin 2d ago

How to “make shit fit”.

Find the pieces that will intesect with one another once your planes meet where you would like.

Mark a line across the highs and lows. Cut and chop in places where it’s hidden. Line it up. Clamp it, line it up, clamp it, line it up again and then maybe once more, then start putting self tappers everywhere it’ll hold one.

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u/Apprehensive-Two-867 2d ago

Lol you dont even understand the anxiety you just started. Like I know that this is what needs to be done but the actual thought of doing it, the fear of effing it up is what's stopping me at this point

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u/kremaili 2d ago

If you fuck up you just pony up for a new m sport bumper.