so i was just searching the net while waiting on an answer and found on one of the other sites that this sound of the backpressure relieving itself upon shifting (hiss sound) may not actually be a good thing. it was said to be "surge" which apparently can be corrected by an ATS housing. i never heard the hiss until i put on the 6637 and ofcourse thought it was cool.
now im really confused. i only know some of the basics when it comes to these motors but nothing technical.
now im getting really confused...anyways, back to the original question posted above.
thanks
by the way...no chip / no gauges yet...stock except for mods listed below
Last edited by traxshin : 01-07-2009 at 04:53 AM.