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I own a 2005 z750 and am thinking of changing the stock exhaust.
is this advisable? I know it boosts bhp but i was also told that its a bit of a nightmare to re-tune the bike and i may have to add dyno jet or fuel commander etc. any advice or suggestion?

it is a royal pain in the arse.unless you like pulling the carburetors off until you wear the clamps out.it is a total waste of time and money.the jet kits suck.

Changing out the pipe may or may not give you more overall hp. It depends a lot on the pipe. There is a potential nightmare looming when you have to match the programming on the EFI to the new pipe. This generally requires a dyno and an expert to do properly. Even when it is done properly, the overall hp gain may show up at the very top of the powerband, while the low to midrange end will suffer a loss. If you're in the drag racing business, this could be a good thing, but not very useful on a street bike.

I used to run the dyno at a friends shop on the weekends. Most of the bikes I ran that had changed out the pipe for performance reasons, actually had lower performance than they did before the change. Flow matching the fuel system to a particular pipe is almost as much an art as it is a science.

Thanks guys. Last thing i want to do is loose bhp!!!! i wanted to put on a new exhaust just so the bike could sound and look cooler. more so for the sound and a few bhp. but what I don't want is to have to re-tune the bike every time i use it. I thought it would be less of a problem cause it seems most the sport bikes i see have a after market pipe.

maltcan2000 wrote:Thanks guys. Last thing i want to do is loose bhp!!!! i wanted to put on a new exhaust just so the bike could sound and look cooler. more so for the sound and a few bhp. but what I don't want is to have to re-tune the bike every time i use it. I thought it would be less of a problem cause it seems most the sport bikes i see have a after market pipe.

If you want to sound and look cooler, then an aftermarket pipe will certainly do the trick. It's just unlikely you'll boost the power without a lot of time, money and effort. I'm not sure what you mean about re-tuning the bike every time you use it. The process I was describing is done when you first install the new pipe. It can be a laborious process to match the intake to the pipe, but once it's done, you won't have to do it again.