just installed scmt1705,high flow through muffler only,and pyro gage.no problems except when i accellerate from about 55 or 60 mph to 70 or 75 mph.once i reach that speed using about half pedal to get there,i let off and i hear from driver side area under the hood, air or boost being let off.is this what it is or is it something else.pyro gage is on500-600 then goes to 800 upon accellerating to 70 or 75mph.Any suggestions?forgot to mention 2001 psd.

 

That's what it is, you just couldn't hear it before. Getcha a big ole intake system in there and she'll really sing to ya'.

 

I installed a 3.5'' exhaust cut-out , that opens with three wing nuts on my truck untill i get a larger exhaust.

You can really hear the boost get out with it open.


swooooooooosh