EXHAUST VALVE SERVO

Hello Legends,
I’m about to finish off my exhaust system without the need for an “Exhaust valve servo”, should i remove it and install one of these?. (Zx10r Exhaust Servo Eliminator)
http://cgi.ebay.com/ebaymotors/ws/eBayI ... MEWAX%3AIT
Also I still have the “Cat” installed on the end of the headers, is this going to make much difference in performance?
I’m about to finish off my exhaust system without the need for an “Exhaust valve servo”, should i remove it and install one of these?. (Zx10r Exhaust Servo Eliminator)
http://cgi.ebay.com/ebaymotors/ws/eBayI ... MEWAX%3AIT
Also I still have the “Cat” installed on the end of the headers, is this going to make much difference in performance?