Has anyone removed the secondary resonators? - The Unofficial BMW M5 Messageboard (m5board.com)

tqt77 · 29th March 2006, 07:25

I just removed the resonators that are closest to the exhaust on Friday. I love the clean high pitch sound on the revs; sounds like a motorcycle.

Has anyone removed the 2 resonators that look like cats?

jfenley · 29th March 2006, 07:50

If I'm not mistaken, those are the secondary cats.

Quote:

Originally Posted by tqt77

I just removed the resonators that are closest to the exhaust on Friday. I love the clean high pitch sound on the revs; sounds like a motorcycle.

Has anyone removed the 2 resonators that look like cats?

tqt77 · 29th March 2006, 07:54

From the pictures posted on Eisenmann website; it looks like it was removed

http://www.eisenhaus.com/galleria.ph...4330&md=E60+M5

jfenley · 29th March 2006, 07:59

Quote:

Originally Posted by tqt77

From the pictures posted on Eisenmann website; it looks like it was removed

http://www.eisenhaus.com/galleria.ph...4330&md=E60+M5

Yeah, you are right - from those pictures, they were definitely removed. I always understood that they were secondary cats, but maybe not. Someone else who knows what they are talking about will have to weigh-in.

BostonRocket · 29th March 2006, 08:26

The set of visible cats are the secondary set. the primary set is higher up on the headers.

'Rocket

Sasheen · 29th March 2006, 09:17

Hi

When removing the the secondry cats ,does it increase/decrease performance?

Does the car sounder louder?

What happens to factory warranty?

i really craving to make mine sound better

tqt77 · 29th March 2006, 09:20

At first I thought it was a resonator because I tried to use a stick to poke through but I couldn't. I think it is a high-flow cat. Does anyone know if it can it be removed and does it help the beast breathe better? Because it looks like Eisenmann removed it by the looks of the pictures from their link.