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Discussion Starter · #1 · (Edited)
So I'm learning about the universe of cat back options for my ST and I have a bit of a twist on the various exhaust discussions. I'm interested to see opinions from people with more experience than myself rank the systems from quieter to moderate to loud.

I'm strictly discussing sound level and not sound quality (as I know that's a whole other discussion). Also with stock down pipe. Based on all my readings and discussions on videos, here is where I'm at:

Quieter:
Mountune
Milltek w/ 2 resonators
FSWerks Stealth

Moderate:
Injen
Milltek w/ 1 resonator
Magnaflow
FSWerks Race
Cobb
Ford Racing
MBRP

Loud:
Roush
Borla
Flowmaster
cp-e

Feel free to disagree with my assessments and add others here.
 
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