Got a set of cops from blaxmax oh maybe 2 months ago. Just got the bike so wanted to put some miles on it before i installed them. Put about 500 miles on the bike before i did install them tonight. They werent hard to install at all. With the stock coils i used to have a hesitation inbetween 4 and 5k. That is now gone. On a warm start up the bike would slowly come up to idle. Now you hit the start buttom and the bike comes right to life. Throttle response it 100% crisper than what it was. I think this mod is worth every penny. Thanks blaxmax.