Resonators are critical to stop droning and since they are essentially straight through, they don't restrict flow by very much at all.
As with most exhaust things, the VOLUME of the resonator will determine its effect on droning.
BA'1.5' Pursuit 290
Lightning Strike / Reflective Orange Stripes
'General' Dog - AP's German Shepherd and Best Mate - 02Dec1998-15Dec2003.
'Pepper' Dog - General's and My Little German Shepherd Sweetie - 1996?-02Apr2006.
'Sako' Dog - My Beautiful and Pretty German Shepherd - 2001?-23Aug2006.