I've got a 2004 E60 535D M Sport. I've already had it re-mapped.
Is it worth fitting a straight through custom exhaust (decat etc) to the car??. Will i see even greater performance gains or would it not be worth it....not notice any difference??. I'm told it will reduce back pressure on the turbo's and allow them to spool up quicker.
Anyone got any experiance in this?. I've been quoted around £700 for a powerflow exhaust.
Any help, thoughts would be appreciated