08 550i sport..Remove resonators or RPI exhaust?

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01-12-2011, 12:39 PM

#11

nomis_nehc

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Haha, I am sure if people have found tips that look similar to RPI's, there would be many people that have jumped on that do get the quad look.

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01-12-2011, 01:16 PM

#12

Pagemaster

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Quote:

Originally Posted by nomis_nehc

Haha, I am sure if people have found tips that look similar to RPI's, there would be many people that have jumped on that do get the quad look.

Maybe I am misunderstanding your post, but it wasn't intended to be funny. Is there some harm in asking? And not quads...just duals on the drivers side.

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01-12-2011, 01:19 PM

#13

ktlocklear

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My Ride: '06 550i '84 Nissan S12 Turbo

Quote:

Originally Posted by Pagemaster

You dont have any pics do you? I have my stock muffler sitting on my garage floor and don't see anything that looks like a flapper.....I have a 2008 550i also.

I don't have any pics.....the flapper is inside one of the muffler tips....the right one I believe. You should see a lever sticking out of the right side muffler tip that has a rod connected to it, that connects to a vacuum controlled actuator.

This is a turbo wastegate actuator...but the muffler actuator looks similar to this...

Also, you might want to make sure that the vacuum line that was connected to your actuator has been plugged when the RPI exhaust went on. If it's not plugged then you'll have a vacuum leak.

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01-12-2011, 01:38 PM

#14

bha7176

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My Ride: SOLD...Jet Black 2008 550i M Sport with SAT, black interior. RPI exhaust and air scoop, 35% huper optik tint all around, CF roundels, flat black kidneys, Springfield Armory XD-40 jet black in glove box, charcoal filter removed.

I'd say go with the RPI exhaust - proven HP gains and awesome sound. Removing the resonators may not give the same performance gains that RPI does.

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01-13-2011, 08:23 AM

#15

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Quote:

Originally Posted by ktlocklear

Also, you might want to make sure that the vacuum line that was connected to your actuator has been plugged when the RPI exhaust went on. If it's not plugged then you'll have a vacuum leak.

Cool, thanks!! I will take another look at the mufflers when I get home, but I don't recall it being there. And, there was no vacuum hose when I did the RPI install. I looked for it and thought it was weird that I didn't have what was shown on the RPI install site. Are there different versions of the muffler? My car is an March 2008 build date.

Thanks again!

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