M performance tips are not welded on. They are installed by using a small screw.
As Isturbointeg stated, old ones need to be cut out, extend the tips and install the new tips.
Honestly it would just be easier to install the whole M Performance system at that point with all the work involved.
Still to this date, the best mod on my car. I LOVE the sound.
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2020 G20 M340 xDrive - Portimao Blue - ZDA|ZPP|ZPX|1CR|1PE|6NW|6WD
2016 F10 535i xDrive - AW - Retired
2011 E92 M3 - AW……………....ED April 29th, 2010 - Retired
2007 E92 335i -Space Gray.....ED Oct 19th, 2006 - Retired
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