Wez Posted September 6, 2007 Share Posted September 6, 2007 Hey All, Does anyone know what affect smaller pipes have on HP output. Most single turbos have a 4"/100mm inlet, I was wondering what would be the effect of reducing this down to 3"/70mm with an inline filter fed directly from outside. Quote Link to comment Share on other sites More sharing options...
michel lane Posted September 6, 2007 Share Posted September 6, 2007 i changed down from 4 inch to 3 inch , i lost 200-300 rpm in spool and the car is not as responsive, but much quiter,i have changed back up now and put a bigger amp in the car...but saying this iam running a 74mm turbo. Quote Link to comment Share on other sites More sharing options...
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