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View Full Version : Stock exhuast: One pipe has metal plate in it?


BMW_M52_M20
05-12-2002, 10:32 PM
My OEM exhaust has twin round exhaust tips and on the right one there is a metal plate sort of thing that blocks the hole? What is this?
Ciao
Jay
*smoke*

330DTM
05-13-2002, 03:34 PM
It's probably like what I have on my car. It's a baffle plate that opens and closes through the use of vaccum hose connected to it.

When you hit past about 3500rpm, the plate will open. But once you drop under that rpm, it will close. It's suppose to, or so I've been told, to make the exhaust less louder at low rpm's below 3500, emissions? and for backpressure?

If you still don't get it, get someone to sit in the driver seat. Then you look at the exhaust tip and tell him to rev the car to 4000rpm or a bit over and u'll see the plate open like magic :)

Furious
05-15-2002, 01:29 AM
my baffle always seems to be open could that affect my bottom end????? because after about 3100rpms my car rockets off,, but before that its pretty normal:huh?:

MP328
05-15-2002, 06:55 PM
i think that's just a piece of steel to hold the bumper in place so it doesn't shake.

and furious it's normal that the car doesn't pull under 3000 rpm the max torque in our cars starts around 4000 to the redline anything under that it feels slowwwwwwwwww

Gamite
05-16-2002, 04:33 AM
Actually, Furious is correct, the baffle plate creates backpressure needed at low RPM's so you get more torque.

Furious
05-16-2002, 02:17 PM
well i asked my mechanic about it, and he said that the baffle closes at lower RPMS creating backpressure for optimizing tourque,, it opens up around 3000rpms or so,,, he said its opened and closed by a vacuumm. fixing it is not tottally neccessary, unless you feel the need,,,,,


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