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Just got Flowmasters series 40 on my car, luckily I have the Shaker 1000 because they seem kinda loud but great. Has anybody noticed any changes in performance and mileage?:eek:
 

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I went with the Magnaflow axle-backs which are really pretty quiet compared to some that I heard on the Romeo adventure! I wasn't after loudness though. If I had gone with anything louder, my better half would have not been overly happy about it! I didn't notice any increase in power or mileage.
 
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