are you ready for this.
I talked to my tuner Bobby today. He said that the tune was actually done with the cutout CLOSED because the dyno wideband can't hook up in the cutout and has to be hooked to the tailpipe. So the car was actually tuned with it closed. The exhaust system I have is 3" custom that follows the stock track not a straight pipe. It has a large "cherry bomber" but no other mufflers.
Car tuned on a closed system made 440hp/510tq at 27psi. Open dump run with no change to the tune made 465hp/495tq. so I picked up 15hp and lost 15tq at 29psi.
As for the runs later in the night, after I closed the dp I made 2 more runs in the loud lane before going home for the night, one was 11.6 the other was 11.7 with a bad 60.
for the setup I was running, I think the open dump helped, but for the setup I am going to I will be running a midpipe.
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