GPZ Intake and Exhaust Mods Revised?

Jerry Clair darkclarity2k at
Fri May 1 21:04:51 PDT 2009

I may be wrong on the stage 1 vs 3....

From: keith fraser <fraskei at>
To: gpz list <gpzlist at>
Sent: Friday, May 1, 2009 8:50:37 PM
Subject: GPZ Intake and Exhaust Mods

I have been considering intake and exhaust options. I came across this page on the muzzy site, , showing the effects of different mods on a zrx 1100. It's my understanding the gpz and zrx motors are very similar.
There isn't much difference in power between the stage 1 and stage 3. I would like to stay with the stage 1 but would like to replace the stock air filter with a K&N. The air filter is tiny, only about 2/3rds the size of the filter in my old Ninja. K&N doesn't list an air filter for the GPZ, anyone know of a compatible K&N part #?
If I did decide to go to a stage 3 would I need to buy the reed block off plates? Is there anything else that would need to blocked off or disabled?
Unless I find a really good price on a used exhaust system I will probably buy the v&h supersport. It fits my budget and is the only black pipe I have been able to find. Does anyone know of any dyno charts for the v&h pipe? Or any other pipe and jetting combos? 
Also I have seen a couple sites recommending changing out the plastic radiator fan for an aluminum aftermarket one, is it really necessary?


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