Does anyone have any info on the preferred / available exhaust mods for the 540i.
I've seen a few posts about bypassing the 'Y' shaped 'resonator' (is this a cat or silencer?) and the extra 'scuba tank' rear silencer.
What are the gains likely to be - do they sacrifice any torque?
I know the M5 system won't fit easily (without mods the the wheel well etc), so what are my available options? I want to be able to hear the V8 nicely - not too loud - without losing any power and hopefully gaining some.