Changing fuelling after exhaust mods

[techno]

Heres another tech topic that has previously been discussed at some length. Given the new board, its worth raising it again.

I have a 2005 S2R800. I got rid of the udder by having a custom mid pipe made and installed. I'm still running the standard end cans and standard air box and filter. I haven't touched the fuelling as it runs fine.

Now I'm after some more noise (the midpipe improves it) and looking for some aftermarket exhausts. i thought about coring the standard cans but I'm more comfortable just replacing them.

At what point do I need to adjust fuelling?

Can I leave it standard with the cat removed and aftermarket end cans?

Do I only need to adjust the fuelling if I open the airbox?

Lets hear your experiences.

[Augustus]

I got the full Termi with DP ECU.  The tech. tuned it during installation.  I would see how your bike runs, you should know if it needs some tweaking.

[A.duc.H.duc.]

You "shouldn't" need to do any tuning if you're just opening up the exhaust. I've even seen a lot of bikes with pipes and airbox run just fine without tuning, but you'll probably be able to generate some horsepower after that.

With just pipes you haven't really reduced the overall air restriction of the system, so you shouldn't see a lean condition.

Again, this will all vary a little bit from bike to bike.

Justin