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down pipes

cats choke exhausts, not mufflers
 

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Midpipe back exhaust HP improvement is minimal over stock--if any, in some cases. DPs pick up 20-30+ whp. Sound will also increase, especially @ WOT.
 

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unless it's a vendor advertising an akrapovic
I stated a midpipe back exhaust--I don't believe they make a claim for the Slip-on system (no midpipe).

I have a Slip-on Akra system & used the OEM tips. I bought it for the weight savings & quality. The sound tone quality is good too, although many of the muffler-type systems sound pretty similar to me...
 

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Midpipe back exhaust HP improvement is minimal over stock--if any, in some cases. DPs pick up 20-30+ whp. Sound will also increase, especially @ WOT.
This right here!
I noticed a big gain on my mazdaspeed 6 when I swapped the DP. I also have the Cobb AP to go with it. I was spitting flames before the Cobb AP tune was on the car. Running a little to rich ha-ha.
 
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