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2015 Honda Civic Si Coupe
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785 Posts
Doesn't really matter. RV6 2.5", Skunk2 and Full Race both are 3" Maybe if you're going to boost, get one of the 3". There's PLM, but I don't know anything about them.
 

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2015 si sedan : acuity/rbc/rdx/plm/hondata/etunez
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350 Posts
any downpipe is an improvement over factory. i rock a plm catless, been holding up pretty well.
 

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610 Posts
I use a full race catted downpipe. I just stuck with their full exhaust system. No issues and been happy with the sound.
 

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18 Posts
Preferably a 3inch downpipe so that you have a straight 3inch system. Any 3inch downpipe will do, you simply need to decide which brand to go with.
 
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