Aftermarket exhaust and mpg...
06-05-2008, 12:40 PM
#1
Contributors
Thread Starter
Join Date: Dec 2007
Location: Vancouver, BC
Posts: 4,508
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: See sig :)
Wondering, since gas prices seem to be climbing daily! If this is a mod I should consider...
Would adding an aftermarket exhaust (2 mufflers, xpipe, no resonators) increase gas milage, drop gas milage or remain same?
Would adding an aftermarket exhaust (2 mufflers, xpipe, no resonators) increase gas milage, drop gas milage or remain same?
06-05-2008, 12:46 PM
#2
Contributors
Join Date: Oct 2007
Location: Thousand Oaks, California
Posts: 11,084
Likes: 0
Received 0 Likes
on
0 Posts
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)
Originally Posted by tbal' post='596440' date='Jun 5 2008, 01:40 PM
Wondering, since gas prices seem to be climbing daily! If this is a mod I should consider...
Would adding an aftermarket exhaust (2 mufflers, xpipe, no resonators) increase gas mileage, drop gas mileage or remain same?
Would adding an aftermarket exhaust (2 mufflers, xpipe, no resonators) increase gas mileage, drop gas mileage or remain same?
Of course this also implies that you will "Keep Your Foot Out of it" which is not an easy thing to do with a GREAT sounding exhaust on the car!! 
06-05-2008, 02:53 PM
#5
Contributors
Join Date: Apr 2008
Location: Houston,TX
Posts: 3,573
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: Original E60 Spec:
530i - Silver Grey Out, Black Dakota Leather In, Navigation Pro, Voice Command, HiFi Audio, Sports Package, Premium Package, Cold Weather Package w/ Heated Seats, Style# 123 Alloy Track Wheels, Auto AC, Power Front Seats, Active Turn Xennon Headlights,
Mods:
OEM M-Tech Front Bumper, OEM M Side Skirts, OEM M5 Rear Bumper, M5 Trunk Lid Finisher, M5 Style Mirrors, Custom Hamann Style Splitter, Custom Hartge Style Diffuser, RD Sport Boot Spoiler, LCI Taillights, Bruce Miranda's V4 LCI Retro Cables, 6000K Xenon light Bulbs, Xenon White LED License Plate Lights, 8000K HID 9006 Fog Lights, Akalius� Front Headlight Euro Overlays, Matte Black Kidney Grilles, E60.Net Clings, Debadged, Llumar Tinting "Micro Edged, 15% Rear 35% Sides,
Engine Mods:
Custom Magnaflow Quad Exhaust w/ Eisenmann Stamped 3� Tips, RPI Scoop (Red)
Added Electronics:
V1 Equipped (Hardwired), OEM Alpine CD Changer Retrofit,
Shoes:
SOLD-20" Staggered Vertini Hennesey Rims, Falcon 452's Tires-SOLD
New Shoes:
19" VMR 710 Hyper Silver, General Exclaim UHP 245/35/19 Front-275/30/19 Rear, Gloss Silver Caliper Paint Job DIY
^_____________
Retired
______________
Took Delivery 10/26/2009: LOADED! E60 M5 Silverstone II/Black, Active Seats, Comfort Ventilated/Heated Seats, HUD, Brushed Aluminum Trim,
Originally Posted by flyingpuck' post='596445' date='Jun 5 2008, 03:46 PM
Theoretically, your mileage should increase!There is less back pressure, so your engine SHOULD work more easily, therefore more mileage! Of course this also implies that you will "Keep Your Foot Out of it" which is not an easy thing to do with a GREAT sounding exhaust on the car!!
Of course this also implies that you will "Keep Your Foot Out of it" which is not an easy thing to do with a GREAT sounding exhaust on the car!! +1
06-05-2008, 04:49 PM
#6
Contributors
Join Date: Aug 2007
Location: Atlanta Burbs
Posts: 1,871
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 08 550 Carbon Sport Almost everything factory, but no sound upgrades.
You may like the sound but I doubt the fuel saving would pay for the new exhuast system. Do the math.
If you improved one mpg (v 25mpg) that is 4% or 16 cents on a 4.00 gallon.
Now take the cost of the new system and divide by .16. That will give you the break even gallons to use to cover the cost of the new system.
I don't have the foggiest the cost of your exhaust system, but you may be looking at 100,000 miles to break even.
I will gladly welcome corrections to my math.
If you improved one mpg (v 25mpg) that is 4% or 16 cents on a 4.00 gallon.
Now take the cost of the new system and divide by .16. That will give you the break even gallons to use to cover the cost of the new system.
I don't have the foggiest the cost of your exhaust system, but you may be looking at 100,000 miles to break even.
I will gladly welcome corrections to my math.
06-05-2008, 08:03 PM
#9
Members
Join Date: Apr 2008
Location: San Jose, CA
Posts: 190
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: Your girlfriend
Shouldn't. You could convert to E85, www.mye85kit.com, for $395, which would help the conversion. The ECU will correct for the higher octane (it will advance the timing) and you'll get better performance.
If there's a greater than .60 cent delta between premium and E85 (provided you get ~20 MPG), you save money, including the worse mileage you'll see from the less efficient E85 fuel. Your injectors will run cleaner (in fact, the alcohol will clean them).
If there's a greater than .60 cent delta between premium and E85 (provided you get ~20 MPG), you save money, including the worse mileage you'll see from the less efficient E85 fuel. Your injectors will run cleaner (in fact, the alcohol will clean them).
06-05-2008, 09:58 PM
#10
Contributors
Thread Starter
Join Date: Dec 2007
Location: Vancouver, BC
Posts: 4,508
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: See sig :)
im happy with just gasoline lol...
sooo, basically, exhaust or no exhaust, i would remain in the same ballpark correct?
Just seems that on my other vehicle, once i added an exhaust, the mpg dropped dramtically...?? could be a mental thing i suppose.
sooo, basically, exhaust or no exhaust, i would remain in the same ballpark correct?
Just seems that on my other vehicle, once i added an exhaust, the mpg dropped dramtically...?? could be a mental thing i suppose.