Guest Posted May 15, 2019 Share Posted May 15, 2019 Hello all =) One of the exhaust options I am looking at goes from 2.5" ART pipe outlet diameter to 70mm (approx 2.75") mid-pipe inlet diameter. Most of the Y pipes from the main exhaust parts manufacturers that I am seeing go from 2.5" to 3". How detrimental is going from a 3" Y pipe outlet to a 2.75" mid-pipe inlet? I'm guessing that it is sub-optimal and will interrupt exhaust flow to an extent, but I have no idea how big a deal this is. Quote Link to comment Share on other sites More sharing options...
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