I obviously have a z400 but I am looking for a full system exhaust now.
I would like to keep it under 600 dollars, what would be the best to get???
I was leaning towards Curtis Sparks, but what else is out there?

Well you have several options, any of which Id recommend over the Sparks:

Pulsecharger, $575, many users here have them and love them, they are great pipes with a killer look

Yoshi RS3 Full System: $475- great pipe for the money and Yoshi is the name in exhaust
Yoshi RS3 Full w/ carbvon fiber can: $525 same exhaust with a really light and trick CF can!

Those are your best 3 options in my opinion. Id go w/ the Yoshi RS3 Full w/ carbvon fiber can. It has the whole package; performance, weight savings, looks and price.

We also carry Big gun, HMF FMF and a few others. However those are my top three recommendations.

Give us a call or shoot me a PM, we can have on to you in a day (depending on your location).

Matt
765 744 0320