Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - 2012 Focus Sedan dual exhaust
View Single Post
Old 01-13-2012, 08:42 AM   #219
Focus Addict
Join Date: Dec 2006
Fan#: 41668
Location: Kaiserslautern, Germany
What I Drive: 2012 Focus SE hatch 5mt

Posts: 968
FF Reputation: 2 lscrx Good Standing Member
Buy-Sell-Trade Rating: (0)
Originally Posted by cobie56 View Post
Question for you all:
someone on this forum mentioned before that altering the back pressure will affect the engine performance/fuel mileage.
Can someone clarify this? will using an aftermarket muffler or an OEM muffler from another brand negatively affect the car's performance? thnx
A cat-back exhaust will not affect the cars fuel economy, if anything it'll improve it. A less restrictive (ie louder) exhaust will give a small boost in power, and the engine will have to work less to match the stock performance... unless the new exhaust makes the driver use the skinny pedal more because they enjoy the aural qualities of their modification.

Posted via FF Mobile
lscrx is offline  
    Reply With Quote