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BMW 5-Series (G30) Forum Engine, Exhaust, Drivetrain, Tuning Modifications M550i vs 540i exhaust tip size/diffuser options

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      04-07-2021, 08:03 PM   #1
KmanM3
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M550i vs 540i exhaust tip size/diffuser options

Does anyone know how much bigger the exhaust tips are on the M550i vs the 540i? I am upgrading to the M performance diffuser on my 540i with stock exhaust and want to leave the door open for future exhaust upgrades.

Many of the 540i aftermarket exhausts specify the M550i diffuser so I am considering getting the M550i M performance diffuser but just wondering if it will look strange when mated to the stock 540i exhaust.
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      04-08-2021, 01:30 AM   #2
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I'm fairly sure the tip size between 540i MPE and stock 550i is fairly similar, if not identical, since they use the same bumper trim (either #51192412410 for diffusor, or 51128067763 for stock) that has the cutouts

I put up some measurements a while back between stock and MPE here, which should give you an indication of how much size difference there is.
https://g30.bimmerpost.com/forums/sh....php?t=1612558
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      04-08-2021, 08:05 AM   #3
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Thanks, this is helpful.
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      04-18-2021, 02:46 AM   #4
matty81
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Yeah they are the same. I have the mpe and here in England all the aftermarket ones have cut outs for the 540i. But I noticed on eBay America they now do an m5 style one specifically for the 550i. So hopefully they will come to the U.K. soon
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