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The difference is definately the x-pipe. Duals FM muffs with no x/h pipe will drone badly, and lose quite a bit of low-end grunt.
I had the 70 series (single) that came with the FM cat-back kit...and it droned some between 1500-1900. I swapped the muff with a Borla XS, but kept the FM piping. Still some drone with the Borla, but acceptable. I may go Borla true duals w/ x-pipe someday.
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'04 Smoke XE CC, 4X4 w/ Preferred Package. Born on 9/16/04
Performance Mods:
aFe Magnum Force Stage II Intake
Flowmaster/Borla XS American Thunder *Hybrid* Exhaust System w/ MF dual tips
Rear Cat Delete--Replaced w/ Dynomax Bullet Resos
Mobile One everywhere except tranny
Airaid TB Spacer
TB Coolant Shut-Off
Active Tuning Grounding Kit
Int/Ext Mods:
SE Pwr Mirror Upgrade
Factory Step Rails
17" OR Wheels
SE Sunvisors Upgrade
20% Window Tint
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