>should i use the mapping off the dynojet website or would i gain that much more by getting a custom map by a dealer with a dyno (it's $275 for a custom map).
You may not get any gains by using a downloaded map. They are a crapshoot at best, even if they are said to be specific for your bike setup.
>I was thinking about getting velocity stacks also (is it worth the money?).
The general consensus is no. A very slight top end gain at the expense of midrange.
>The boz bros exhaust sounds awesome but don't think it does much for performance. I have the stock headers and a yoshi pipe also. Would I gain that much more power by switching to that exhaust setup verses leaving the boz bros on? Any input or more ideas are much appreciated.
I don't know about that exhaust specifically, but in general, most aftermarket full exhaust systems have larger pipes and have optimal scavenging at a higher RPM than a stock exhaust, meaning you lose some low end and midrange torque to get higher top speed HP. Also, since a full exhaust system increases airflow and changes the air/fuel mixture, you have to have the A/F map changed accordingly. So, if you are running a full system on a stock ECU or untuned Power Commander, it might well run like a dog. Reverting to your stock system will probably make your bike feel more powerful in the RPM range where you run it most.
In any case, do all the mods (exhaust, air filter, cams, thinner gasket, or anything else that changes the air flow) before you get the bike tuned. As you can see it's pricey but a custom tune is the only way you can realize the performance of those types of modifications.
Last edited by Mister Tee; 03-19-2009 at 08:59 AM.