GSXR - I have thrown away dozens of "good" stock and aftermarket bushings...there is a difference, the reviews down lie - that said....the better your coupler is, the smaller the change will be...but take a look at my video link..the coupler I was rebuilding had aftermarket bushings that were so tight the parts might as well been welded together....I see quite a few of those...
if you replaced the bushings yourself...you should know their current condition and can make a choice rather this is worth the $ or not for you....
you could see a new website if you type the following all together - the coupler whisperer dot com
SHHHHH..it's new untested