How to check the catalytic converter on your F15?

[donniemcm]

Hi!

Long story short, my left end-pipe/tailpipe disappeared/felt/was stolen (this will remain a mystery). Therefore I am looking for one.
But my main concern now is to find out if my catalytic converter has been stolen!
With the view from underneath I could have, I think it was not.

Based on this custom cata provider it seems the cata is right before the engine and at the front of the car: http://supercircuit.blogspot.com/201...npipe.html?m=1

So on the F15 (mine has a MPPK with MPE exhaust though) it's like this:
From the end the muffler have one trapezoidal tailpipe on each side, then there is only duct to the engine.

Is my understanding correct?

Thanks!

[Smonkbmw]

Depends on what engine you have

[suitedcboy]

If the cat was stolen the car would be L O U D, not nice tones, just crappy loud.

[donniemcm]

Originally Posted by Smonkbmw

Depends on what engine you have

It's a 35i

[Chilled]

Oh no based on that photo, it looks like not only did they steel one of the exhausts but they also stole 2 cylinders.

Sorry couldn't help my self.



If your undertray looks like that, then you have a 6 cylinder engine and those only have the 1 exhaust pipe. Only the v8's have the dual exhausts.

The cat sections is the silver/shiny bit going up.

So if your under sides look like that, your fine. Nothing was stolen.

[donniemcm]

Originally Posted by Chilled

Oh no based on that photo, it looks like not only did they steel one of the exhausts but they also stole 2 cylinders.

Sorry couldn't help my self.



If your undertray looks like that, then you have a 6 cylinder engine and those only have the 1 exhaust pipe. Only the v8's have the dual exhausts.

The cat sections is the silver/shiny bit going up.

So if your under sides look like that, your fine. Nothing was stolen.

Thanks for your answer!
I admit I never check underneath and usually pictures shared are with 2 pipes. But mainly I see on those news that the cata is in the middle part of the car. Not sure if it's BMW specific that it's located close to the engine.

Thanks again!

[donniemcm]

Originally Posted by suitedcboy

If the cat was stolen the car would be L O U D, not nice tones, just crappy loud.

Mine has the sport exhaust with MPPK so it's quite loud already
But I guess the loudness you are mentioning is unusually loud

[Qsilver7]

Originally Posted by donniemcm

It's a 35i

Thanks for posting info as to what engine you have…it’s needed to help give you correct information.

The catalytic converter on your BMW (w/N55 engine) is up front right off the engine’s exhaust manifold…so they are not easy to steal. You can see the progression from the front of the car to the rear for the exhaust system:

Cat is up front off the engine…


…then there’s the front exhaust section…


…which connects to the rear section with the muffler..

[lonestar22]

BMW thankfully tucks the cats into the engine bay. Thieves would never be able to steal them. Most likely you're just missing an exhaust tip.

[donniemcm]

Originally Posted by Qsilver7

Thanks for posting info as to what engine you have…it’s needed to help give you correct information.

The catalytic converter on your BMW (w/N55 engine) is up front right off the engine’s exhaust manifold…so they are not easy to steal. You can see the progression from the front of the car to the rear for the exhaust system:

Cat is up front off the engine…


…then there’s the front exhaust section…


…which connects to the rear section with the muffler..

Wow thanks for the super detailed explanation!!
It clears any doubt off !
Then we're lucky BMW put the catalytic converter in such place

[donniemcm]

Originally Posted by lonestar22

BMW thankfully tucks the cats into the engine bay. Thieves would never be able to steal them. Most likely you're just missing an exhaust tip.

Yes. Thanks everyone for the explanations and thanks BMW for this design