I've tried a few pipes in my few years of rideing and I've setteled on Bassani pipes, They've been around a long time and know what they are doing, but As stated above, what works for one bike ain't quite so good for another. What you need to ask yourself is do you want torque or hp? Different pipes do different things. You do more city or long haul rideing? Another thing to consider. As told above, some pipes work better at different rpms. Alot of things to look at to be truely "informed" about pipes. Read what was suggested, it will help you to understand your decision better.