Join Date: Jul 2002
Location: .. I simply am not there
If you're fully stock and you only open up your exhaust, you'll take a hit at the top end (as I experienced @ the dunes).
The throttle seemed to respond a bit better and engine stalled at a lower RPM.
If you take the noise baffle off of your snorkel, you'll definitely need to re-jet.
----- copied from forums.atvconnection.com ------
Here's a list of what I've done (besides adding armor) all prices don't include tax or shipping & handling and are in US funds
(Free) cut out pea-shooter from stock exhaust pipe
(Free) remove snorkle cap and cut holes in top of airbox
($5) 140 Main Jet (has not been trail tested, may need 145 or 150)
($0.20) two No.4 washers to raise needle height (has not been trail test, may need to use only 1 washer or 3, it definitely needs a washer)
($5.00) speaker fabric to act like an "outwear"
($22) Uni filter
($208) 22Hx12Wx10wheel Realtors on Douglas Red Labels 0.190
($14) 13 tooth front sprocket
($0.78) 7/8 inch clip to hold on new sprocket
The re-jet, exhaust hack, Uni filter and air-box hack (Total:~$32) have definitely helped the Z's low end. It seems to stall at a much much lower RPM. It hits the rev limiter a bit faster now (according to my butt-dyno)
You can spend $70 for the alba K&N and outwears + $60 for a dyno jet kit or you can do what I did for 1/4 of the price.
If you have any specific questions, feel free to PM me or reply here. I always check threads I've posted in.
BUY CORPSIE A 2009 Z400 (w/EFI) and you'll get his economodded 2003 Z400!