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Discussion Starter #1 (Edited)
Before I added my Magnaflow catback system, my car was getting 35-40 mpg; and after I installed it I'm now getting lower mpg. I've had the catback since June and I'm now thinking about changing my short ram intake with a cold air intake; and maybe this might get my mpg back up.
Any suggestions?

Honda Civic 2006 auto ex K&N s/r Magnaflow catback system
 

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It's really how you drive. I bet before you had your exhaust you were driving more conservative. With the exhaust you've been hitting WOT more often than average which will lead to less gas mileage.
 

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Additionally, your ECU is tuned to run with the stock components. Changing out those parts all affect how your car thinks it is performing and forcing it to make adjustments, often times having a direct effect on MPG, hp, torque, how rich/lean it runs, etc....
 
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