Exhaust question

[Marky]

Hi guys,

Am thinking of changing the exhaust on my 330 saloon.

I have noticed that in one of the pipes there is a flap type device that seems to open and close electronically. If I change the exhaust system to another brand does it have the same flap or not.

If not where does the cable then go. Do I just insulate it and tape it up somewhere ?

Do you guys in the states have Powerflow exhausts ? They are custom made to each individual car ? I am thinking about 4 pipes. Can anyone see any performance downside to this ?

Many thanks in advance

[MarvelPhx]

The "flap" is a noise-regulator to meet strict European sound level laws. If you are in the US, you don't need it.

It is actuated by a vacuum line which you can disconnect and should seal off when you install an aftermarket exhaust. It won't hurt anything.

[Marky]

thanks for that Marvel.

So if the vacume tube was removed now, would the flap remain open and if it did, would car produce a different note ?

[MarvelPhx]

Yes, and yes.

It will stay open and will make more noise at low rpms.