08' FZ6-S2 I like a quiet exhaust:do they make a quiet slip-on that Breathes ?

grahammarsden said:

Increasing the airflow on a fuel injected engine will just tend to make it run lean, because the ECU map is designed around the stock exhaust with catalytic converter and will keep delivering a set amount of fuel, although the FZ6 S2 compensates somewhat by having an O2 sensor in the exhaust.

Really, you need a Power Commander or similar to remap the fuel system.

Personally I have the stock setup on my S1, but I also have the PC III with the Dual Map switch that means I can either have the standard map that just evens out the power curve (and takes out the "hole" that Yamaha put in between 5-6000 rpm to give better emissions figures) and the "fun" map which gives a big boost to mid-range power, but also costs about 25% of the fuel efficiency.

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