Hello! Not to hijack a thread but...I searched google to fix drone in my Z32TT and somehow found this thread.
My setup is 3'' dp and 3''->2.5'' tp with 2.5'' Greddy SP exhaust. My butt-dyno is saying I gained about 30whp but I do have annoying drone at 2300rpm-2900rpm lol. I have to speed up to 75+ mph to quiet down drone.
Since exhaust diameter is different which diameter should I use for my setup? 2.5'' or 3''? Based on what I've read 28-30'' capped pipe sounds about right? Thanks in advance!
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