is it worth the money and will it make blowing it up easyer?

 

I'm not sure. It is good because you can rev your engine higher and get the most out of it. But, if you always keep it on really high revs it is not good for your engine... If you were to get it, get all your other mods 1st.

 

its ok for the motor,but why not put in a cam and some lighter valves to compensate with the higher RPM.

 

If you are thinking about the rev-limiter get pipe & rev at same time will feel the power inprove alot and throttle responce thats if you are talking about the 400 ex only reason I say that is I see you have a z440 and if you dont have a rev-limiter you have a lot of power to gain by adding one to your z- 440 you could gain 3-5 hps with one if you dont have one. PS DYNA cdi you can change power for hill climbs& top speed on fly button on handle bars ajusts between two power curves its alsome.