Exhaust Resonator
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Model Year: 2007
huh??
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My Ride: 2004 545i - 6 speed manual (July 04 build), silver-grey/black, sports package std equipment (18", active roll, active steering, adaptive headlights), premium sound, bluetooth enabled, folding rear seat, lumbar, 3m hood/bumper protective film, rear tint, euro reflectors.
Originally Posted by houbmw' post='295108' date='Jun 9 2006, 08:13 AM
huh??
There are two sets of resonators on this car - most cars will only have one. Resonators do not add much back pressure. They are typically a inner tube with holes drilled in it, wrapped with an outer tube that has some type of insulation. They are designed to remove the harmonic drones that can occur at particular rpms (basically they remove the resonant frequencies of the exhaust and make it quieter, when used in conjunction with a muffler.
There are two tube resonators just towards the front of the car that almost look like catalytic converters.
Then there is a box resonator that is at the rear differential.
Unfortunately it is not an easy/cheap task to play with the options. Further, when judging sound, it is so subjective to personal preferrence.
I think the safest route for adding more sound or lowering backpressure is to start with changing the muffler.
On the 545i/550i, the exhaust is pretty good for flow, so you are not going to see huge gains. It really becomes a sound/looks issue.
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Originally Posted by Don Juan' post='296163' date='Jun 12 2006, 12:34 AM
and about 70lbs weight reduction 
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My Ride: 2007 550i White/Black, SMG, Sports Pkg, Comfort Access, Nav, HUD, Satellite Radio, Anthracite Maple Trim
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Originally Posted by Hamann5' post='296173' date='Jun 11 2006, 10:06 PM
yaaa I had to carry my muffler from the shop.. that thing was heavyyyyyyy
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