Hello ALL, Is it true that blueing of the pipes means it is improperly tuned? I have a 2006 FHLT with Fuel PAk, K&N Air filter and Rush 2.25 slip ons. They recently over the late summer seemed to blue more. I should of listened to the knowledge here and got a TFI tuner. I am stuck with the fuel pak that only has presets. Thanks for more wisdom.