[ReyT]

Originally Posted by pavo335

i thought the flapper was only closed on cold starts and once the engine warms up a little it is always open. When i start the car in the mornign yep nice and loud sitting in the drive (helps get the girls outa bed ) but half way to work sitting at lights quiet as stock???

pretty sure the flapper only opens on cold start and once warm only after certain RPM.

you should try a cold start with no cats and BMW PE... have to do the drive of shame out of my street lol..

[Stuart@BMRAutowerkes]

Originally Posted by Scootah

IIRC keeps flapper open all the time

Yes it does keep it open all the time...

but above 3k rpm, golf tee mod or not, the flap will open itself


OEM spec: cold start or not, the flap is always closed under 3k rpm. Opens naturally above 3k.

Golf tee mod: forces flap open all the time. Hence cold starts become quite loud.

[cartaa100]

The PE is defiantly worth it for the n54!