hi guys
A mate has an M5, he has bought an exhaust with the electronic flappers in it.
The fitting instructions say to disconect the battery to fit the exhaust.
Is it ok to disconect the battery or will this cause trouble with the cars brain etc.
Thanks for your help guys.

 

at worst it would put the engine ecu into learning mode were it re learns the idle and a few other settings until it has run for a few minutes, it wouldnt worry me

 

ok mate, many thanks for the info, should be ok to disconect the batt then cheers

 

E39? You could kill the nav if it's a mk3 and it's still writing to the the memory. Make sure the light is off for a while on the nav drive before disconnecting the battery!

 

His M5 is an E60.