I recently just did a stage 1 with the Arlen ness a/c did the fuel moto micro tuner and removed cat with thunder header slip-ons. I rode today for first time and when I give gas I can hear it sucking from air cleaner. Is anybody running this similar setup and is this normal just trying to see if its right or not? Thanks

 

normal.

 

Your engine is just a big air pump.
Going to an aftermarket (more open, less restrictive) air filter, makes it much easier to hear the air being sucked into the engine.

 

Not to sound trite, but those high volume air cleaners really do put more air into the engine. Of all the things I have done to my bike, the Stage 1 air cleaner was a big, noticable improvement. You needed that if you were going to install your fuel managment device.