I don't have the charts to back this up, but I gained minimum 10rwhp with it open than closed...but when mines closed it is going through full exhaust with closed up borla.

 

Exhaust "pulsing"/scavenging is the job of header collectors. Not cut-outs. A cut-out is good for nothing more than the exhaust finding a "BLAAAAAAAAAAAAAAAAAHHHHHHHHH" path of least resistence.

 

i would think somethings not right if you gained power with it closed. backpressure is never a good thing.

opening/closing mine i notice a difference in the power curve. When i open it i feel more power up top and less down low, but thats just me

 

thats how it should be, you lose tq and gain hp.

 

I will add that my car runs .2 seconds faster with my cut-out open.

Frank
CPT

 

That's the way my car was before I did the heads/cam to it. I will find out for sure tomorrow when I go to the track.


The car is down on power somewhere and only went 12.7 @ 109 with the cut out open but nothing has changed since then except for the cutout being closed so we'll see what it does.


Eddie


P.S. I Love my trans!

 

I ran a 13.02 w/ no exhaust on, 13.200 with cutout open and 13.3s with cutout closed.

Make sure you make runs with similar 60's and on the SAME DAY to prove this theory, as you can see most of us have proven it the opposite way.

 

hey man i here yeah on motor i gain 2 to 2.5 mph with the cut out closed
but i lose about 1 tenth ????
its wierd but i like mph more so i just leave it closed and it pisses off less people lol

 

Thanks, Eddie. We're glad to hear all the positive feedback.

Frank
CPT

 

Ok guess you know it.I guess I thought the exhaust work as a system to ...well exhaust? I never heard the BLAAAAAAAAAAAAAAHHHHHHHHH theory.

 

My car ran 12.00 to 11.9s with it closed and 11.50s with it open, mph went from 116 to 120. but this is with a 383.

 

Like I said hopefully I can get to the track tonight.

 

It's raining and nasty out so I guess I'll have to wait until Friday.

 

i knocked off .4 and gained 3 mph in the quarter with mine open....

 

i dont give a rats *** what the differance on a dyno is, with mine closed i run faster at the track, i have dual cutouts 8 inches after the collectors, i open them when i go to a car show to sound cool i guess its my inner redneck comming out