The MPE will be covered under BMW warranty should anything happen to it, meanwhile the audio is a bit complex in these cars(amps and whatnot) so you lose some protection with the aftermarket nature of the BSW products.
I find the stereo adequate enough(ignore my Integral Audio setup of $5k-as it was free) but the exhaust really wakes things up.
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'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'15 Buick Regal "T"(wife)
'06 Saab 9-5 Combi 5mt (full suspension, LSD, clipped turbo etc)
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