RPI Exhaust Silencer!
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Joined: Jan 2008
Posts: 94
Likes: 0
From: Denver
My Ride: 2005 545i
Members
Joined: Jan 2008
Posts: 94
Likes: 0
From: Denver
My Ride: 2005 545i
rpi silencer dyno on an e60 m5:
https://5series.net/forums/topic/876...1#entry1034264
I've read a few postings by rpipower/eloy stating the HP loss is minimal as shown on this dyno above. I highly doubt you will "feel" the slight loss in performance as no one's butt dyno is that sensitive IMO. The fact that the silencers can be installed and removed fairly easily makes this an option for those that want their exhaust a little quieter when they are DD'ing or hauling the family/friends/clients/etc..but on the weekends and/or for spirited driving you'd like a little more audible feedback
https://5series.net/forums/topic/876...1#entry1034264
I've read a few postings by rpipower/eloy stating the HP loss is minimal as shown on this dyno above. I highly doubt you will "feel" the slight loss in performance as no one's butt dyno is that sensitive IMO. The fact that the silencers can be installed and removed fairly easily makes this an option for those that want their exhaust a little quieter when they are DD'ing or hauling the family/friends/clients/etc..but on the weekends and/or for spirited driving you'd like a little more audible feedback
Contributors
Joined: Oct 2007
Posts: 11,084
Likes: 0
From: Thousand Oaks, California
My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
Retired Rides - 1989 325i convertible, 1995 M3, 2002 X5, 2005 545i, 2008 X5 (Lemon)
rpi silencer dyno on an e60 m5:
https://5series.net/forums/topic/876...1#entry1034264
I've read a few postings by rpipower/eloy stating the HP loss is minimal as shown on this dyno above. I highly doubt you will "feel" the slight loss in performance as no one's butt dyno is that sensitive IMO. The fact that the silencers can be installed and removed fairly easily makes this an option for those that want their exhaust a little quieter when they are DD'ing or hauling the family/friends/clients/etc..but on the weekends and/or for spirited driving you'd like a little more audible feedback
https://5series.net/forums/topic/876...1#entry1034264
I've read a few postings by rpipower/eloy stating the HP loss is minimal as shown on this dyno above. I highly doubt you will "feel" the slight loss in performance as no one's butt dyno is that sensitive IMO. The fact that the silencers can be installed and removed fairly easily makes this an option for those that want their exhaust a little quieter when they are DD'ing or hauling the family/friends/clients/etc..but on the weekends and/or for spirited driving you'd like a little more audible feedback
Contributors
Joined: Oct 2007
Posts: 11,084
Likes: 0
From: Thousand Oaks, California
My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
Retired Rides - 1989 325i convertible, 1995 M3, 2002 X5, 2005 545i, 2008 X5 (Lemon)
Just saying! 
Senior Members
Joined: Mar 2011
Posts: 434
Likes: 0
From: Northern California
My Ride: 2008 535i
I have an Ac Schnitzer/REMUS exhaust and you really only hear it at high RPM's. Might be a good alternative also.
RPI sounds amazing though!!! im probably saying that cause i have only heard them while they were driving by
here's a sound clip of the ACS which is actually remus with a $2000 sticker over it.
RPI sounds amazing though!!! im probably saying that cause i have only heard them while they were driving by
here's a sound clip of the ACS which is actually remus with a $2000 sticker over it.
That sounds puuurfect! Have you dyno'd your car yet? What type of gains have you seen with the ACS? I have been looking for a nice sounding exhaust without the drone. Not because its annoying but because after driving a buddies car for two weeks with the RPI installed, i would actually have to fight to keep from dozing off on my drive home after a long day at work. Yes! it would actually put me to sleep. I think i may have found it.
Senior Members
Joined: Jan 2010
Posts: 1,521
Likes: 1
From: Houston, TX
The dyno of an M5 will be drastically different than that of a turbo engine vehicle since air flow plays such a larger impact on a turbo. The M5 dyno is very informative thanks for posting it. Would be very interested to see a before and after turbo dyno.
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Joined: Jan 2008
Posts: 17,508
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From: So. Cal (SFV)
My Ride: 2011.5 Alpine White E90 M3 | Black Novillo Leather | Carbon Fiber Leather Trim | ZCP | ZP2 | M-DCT | Navigation | Moonroof | 6FL Mods: TMS 12.5mm spacers all around l Hawk HPS Brake Pads l OEM M3 Edition Grills l Paint Matched Side Gills l Key Hole D
Contributors
Joined: Oct 2007
Posts: 11,084
Likes: 0
From: Thousand Oaks, California
My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
Retired Rides - 1989 325i convertible, 1995 M3, 2002 X5, 2005 545i, 2008 X5 (Lemon)
Eloy makes these himself, but if it's not an RPI, it may be a bit more difficult. I do have a connection over at Billy Boat, and they make a different silencer (resonance cone) that can be used on any exhaust as it is installed inline BEFORE the muffler. Let me know! 