I just wanted to report on my findings on the Performance of this mod package, ( 26” big horn og tires on 12” steel rims, clutch 1.5mm shim, EPI purple spring, EHS air box mod K&N filter, EHS air box lid, EHS fuel controller, 2R tip) With my totally stock grizzly, top speed fluctuated between 67-68 mph. And not very snappy off the line but after it got rolling it was very responsive to the throttle, radiator fan cycled quite often, backfiring on deceleration was hideous! With the mods above, top speed fluctuated between 62-63 mph. I noticed it would stumble a little at 63 mph. I wondered if it was boarding on the rev limiter because of the shim mod? Very snappy off the line and all the way through the power band. Air temperature Today was 60 degrees, did not notice fan cycling, backfiring on deceleration was Virtually nonexistent. This is my nonprofessional findings, hope this may help someone.