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There is JB4 no Jb3 for the F10.
The stock muffler basically kills any sound coming from the engine.
JB4 does makes the sound louder but I already have mufflers before Jb4, so I can't compare stock.
It is fun but definitely nothing close to the V8 turbo or a small car with N55/N54, even with stage 2. If you seek those hard pulling sensation, it is just not there.
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14 ///M5 Competition Frozen White
Ultimate Pkg - Dinan D-Tronic S2/M Performance Ti Exhaust/3D Design Lip/AC-S Roof Spoiler
12 535i xDrive MSport AW/CB/HUD/TECH/APP/EXE/JB4S2/20"356/H&R//VorsteinerLip/M5Diffuser/GT-C
04 745i Sport
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