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309 Posts
Hi,
I can't speak in any exact or absolute terms, but there's one factor that might affect overall performance: The weight!
The Termis are definitely lighter than the stock exhaust, the Staintunes also, don't know by how much.
Another thing, just to elaborate on jeff_quan's point ... as far as I know, the stock ECU does rely on the oxygen sensor, so it doesn't play 100% well with the Power Commander. However, the O2 sensor is only used below a certain RPM. 4000RPM? 5000? (I think!) So if you add a Power Commander, useful though it is, the stock ECU basically ignores the Power Commander in the RPM range where the O2 sensor is used. That's where the FatDuc O2 manipulator comes in, and serves as a tweak button to fix the range where the stock ECU overrides the Power Commander.
So, you can work with the stock ECU, but you will very probably need a FatDuc, and a Power Commander is also very useful. At least if you've modified the air intake / exhaust, like if you modify the airbox or add a performance exhaust. O2 Manipulator + PowerCommander (or similar) may be the cheapest way to obtain better performance.
The best performance, regardless of price, is probably the Termi kit + Power Commander.
Staintune in between, but it also needs some fuel controller adjustment.
But as I said, I can't be sure ... I don't have a bike and I haven't done any of this. I'm just trying to be prepared for when I get the bike. But please double-check anything I state. Hope I could help.
I can't speak in any exact or absolute terms, but there's one factor that might affect overall performance: The weight!
The Termis are definitely lighter than the stock exhaust, the Staintunes also, don't know by how much.
Another thing, just to elaborate on jeff_quan's point ... as far as I know, the stock ECU does rely on the oxygen sensor, so it doesn't play 100% well with the Power Commander. However, the O2 sensor is only used below a certain RPM. 4000RPM? 5000? (I think!) So if you add a Power Commander, useful though it is, the stock ECU basically ignores the Power Commander in the RPM range where the O2 sensor is used. That's where the FatDuc O2 manipulator comes in, and serves as a tweak button to fix the range where the stock ECU overrides the Power Commander.
So, you can work with the stock ECU, but you will very probably need a FatDuc, and a Power Commander is also very useful. At least if you've modified the air intake / exhaust, like if you modify the airbox or add a performance exhaust. O2 Manipulator + PowerCommander (or similar) may be the cheapest way to obtain better performance.
The best performance, regardless of price, is probably the Termi kit + Power Commander.
Staintune in between, but it also needs some fuel controller adjustment.
But as I said, I can't be sure ... I don't have a bike and I haven't done any of this. I'm just trying to be prepared for when I get the bike. But please double-check anything I state. Hope I could help.
