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Old 01-13-2012, 09:32 AM   #218
cobie56
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Join Date: Mar 2011
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Location: northeastern, NY
What I Drive: '01 ZX3, '14 Civic XL '12 SEL

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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
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