Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - 2012...Magnaflow good choice?
View Single Post
Old 01-11-2013, 10:35 AM   #3
Focus Addict
suss6052's Avatar
Join Date: Feb 2012
Fan#: 95752
Location: ..., MI
What I Drive: 2013 Ford Focus ST2 Ingot Silver

Posts: 13,920
Points 12,333, Level 72
Points: 12,333, Level: 72 Points: 12,333, Level: 72 Points: 12,333, Level: 72
Level Up 71% Completed
Level up: 71% Level up: 71% Level up: 71%
Forum Activity 5%
Activity: 5% Activity: 5% Activity: 5%
FF Reputation: 40 suss6052 Great Standing Member
Buy-Sell-Trade Rating: (3)
Originally Posted by Slo86GT View Post
Cat back or just a muffler?

I'm trying to figure out if the 2.5" catback from an ST, modded to fit, would be a better choice than the standard 2.25" model for the N/A cars currently...
The 2.5" would have a lower restriction than the 2.25" tubing, however if you go too large you reduce the backpressure too far and start to hurt performance.

Its been discussed that the 2.5" might be a better plan if you are planning on adding additional power adders down the line. If the limit of your modding is an intake and exhaust and nothing else a 2.25" exhaust may work better.
Moderator for: DURATEC Ti-VCT Performance, ST Performance, MK3 Focus
suss6052 is online now  
    Reply With Quote