I remember hearing from a few people that with the cut out open, your times are actually worse than with the cut out closed. Something about not enough back pressure for the LT1. So when I go to the track, should I leave the cut out closed?

 

Opening my cutout dropped my 1/4 times .2 seconds....From a 12.25 to a 12.05.

Frank

 

Wow, thats pretty impressive you can pull those times with the high mileage bottom end.

 

I gained 2 mph with my cutout open.

 

absolutely open

 

Backpressure is for the weenie 4 bangers..........open it up......gain a little power and the sound is awesome!

 

like markymark said, we don't need backpressure so open it up

 

Running my cutout open at the track increased my mph for me too.

 

WTF is backpressure

 

This seems to be the biggest BS rumor that is always spread...that you actually lose power without back pressure. You gain power and lose a little torque.

 

i gained 9hp and 8 tq on the dyno with it open.