new akrapovic exhaust

if it is running well you dont need to, but it *might* give you slightly more power if you do it.
Normally a bolton does not require a rejet, but its never a bad idea.

I've fitted the Akrapovic Ti bolt-on, K&N filter and Dynojets jet kit last friday. The mechanic then tuned it up. It has some "hesitations" in some rev ranges, so it needs a bit more tuning, but it feels great anyway. The exhaust sounds awesome!

You do not need to rejet. Doing so will give you better response, and more HP, but... it will also drink more gas. The thing one should always do, no matter if rejeted or not, is to fine-tune the carbs after any kind of change on the engine. Some guys don't do it and then start complaining about backfiring and sputtering.

You will almost always get some gains from proper jetting or fuel mapping (FI bikes)...

The question comes down to the cost, and whether more precise mapping or jetting is worth that cost to you. If you've added an aftermarket exhaust, filters, etc, you are going to see gains in the powerband by optimizing your air-fuel mixture, although with a bolt-on can likely not HUGE gains. However, it's not unusual to gain 1 or 2 horsepower on top and solve any lower-rpm roughness by rejetting or remapping after installing even just slip-ons or bolt-ons, and you may find that this gain, along with better throttle response (crisper everywhere) is well worth the cost of installing a jet kit or power commander unit.

However, if you're tight for cash, only you can decide if it's worth it. The money could definitely find a good home in upgrading riding gear, etc, if the bike isn't running too rough. Full exhausts will almost always basically REQUIRE a remap for decent performance.

thanks for the info.. right now the bike is riding fine. I really have'nt notice any roughness at idle or at speed..but i will keep everything in mind if something happens.