Cmr0z28

13.5@103 2.0 60'
13.5@103 1.9 60'
13.5@103 2.0 60' - cutout open
13.4@103 1.9 60' - cutout closed
13.5@103 2.0 60'

90 degrees
85% humidity
29.94 pressure

28psi in the BFG drags dead hooking every time (no burnouts, just peeled out to clean them off).

I posted this in LT1 tech because there's so many questions asking if cutouts gain HP. Well, I answered that question. You do the math.

TobyZ28

Not much change at all. But you already have a fairly free flowing hooker exhaust so I suppose any gains (if any) would be minimal...

crAzy95z28

wheere did you put the cutout? if i had them i would put them right before my cats, and right after headers!!

Cmr0z28

I have no cats. The cutout is right after the Y-pipe.

I didn't gain any trap speed which means I didn't gain any HP, so I basically just lost low end torque which was shown in my 60' time.

jasons93z

shoulda put the cut-out closer to the muffler

Z-RATED94

No flame intended here, but just because your set-up responded this way, doesn't mean other people and their set-ups might not have different results.

Cmr0z28

So you're saying another bolt-on car is going to gain something? My point is, the Hooker is already so free flowing that the cutout is useless for me.

The cutout exits under the rear passenger hump in the floorboard BTW, sorry should have clarified that.

Z-RATED94

Yes, that's what I'm saying. Bolt ons can mean many things. Someone with another 20 HP worth of bolt ons might cut some ET by having the cut-out open. It's to bad it didn't help you out, but it might in the future with any other upgrades you might add.

Cmr0z28

Well yeah I know that.

When I say a bolt-on car, I'm talking about one that already has a cat-back.

Z-RATED94

OK then, talk to you later.

david97gsxr

i too saw no gains with my cutout open.

and i have longtubes, no cats, CAI, drag radials, and a catback.


i'm sure a cammed car would see a difference. as a matter of fact, i know a 98 camaro that ran 12.5 through true duals, and 12.2 with dual cut-outs, 10 inches behind the collector. but it has a cam. but the runs were on different days. so...isn't totally accurate.