[LiLS]

What downpipe options do we have for the 550i?

Ive seen active autowerks or is there other options

also im mainly interested in it for the sound so is catted or non catted the better route.


thanks for the help guys!

[badblack550xi]

AR

[RSBro]

AR catted are on my list.

[///M5Driver]

Originally Posted by badblack550xi

AR

Just to add to this, what are you guys doing for the CEL associated with the catless DP's? Do you use anti-foulers?

[badblack550xi]

Originally Posted by e46beater

Just to add to this, what are you guys doing for the CEL associated with the catless DP's? Do you use anti-foulers?

I am catted... i would go cat-less but can tool no longer made by Terry..... i believe super sprint uses faulers and they actually work... but super sprint is super expensive.

[LiLS]

is the sound difference huge between the catted and non catted? i just wanna hear that turbo spooool!

[///M5Driver]

Originally Posted by badblack550xi

I am catted... i would go cat-less but can tool no longer made by Terry..... i believe super sprint uses faulers and they actually work... but super sprint is super expensive.

You can make your own pretty easily. It's just a couple pieces from the autoparts store and a quick drill to make the sensor fit. I've used them on a lot on new cars that didn't have tuning support yet like Subarus and C6 vettes/other GM vehicles.




I'm not familiar with the position of the secondaries and as you can see it extends the sensor our pretty far so a right angle bung might be necessary.

[badblack550xi]

Originally Posted by e46beater

You can make your own pretty easily. It's just a couple pieces from the autoparts store and a quick drill to make the sensor fit. I've used them on a lot on new cars that didn't have tuning support yet like Subarus and C6 vettes/other GM vehicles.




I'm not familiar with the position of the secondaries and as you can see it extends the sensor our pretty far so a right angle bung might be necessary.

i used to make them for my G35 never tested on 550.. i heard some people had CEL even with faulers...

[///M5Driver]

Also I've been looking at images of the stock DP vs aftermarket and maybe its just the photos but I dont see a huge difference in overall size and shape. I might just punch my factory cats out if this is the case.

[berkel]

Regarding the anti-foulers, I used them on my Evo per this thread:

http://forums.evolutionm.net/evo-how...cel-light.html

I never got the CEL, but you may need to adjust accordingly to get the right setup. For example, you may need to double them up. You are just backing the o2 sensor out of the exhaust stream to make it "see" less crap and read clean.

[mike@x-ph.com]

AR Donwpipes .
You have 3 options catted , catless and catless with resonators

[LiLS]

whats resonators do ? muffle the sound right?