Cobra Commander

iTrader: (12)

H/C car

exhaust: Hooker Super comp headers, ORY, TSP Rumbler

CaptainSS1

Depends on what you are looking for and what it is a cut-out on.

As a noise maker - it is quite effective.

For power, on my car which the exhaust is noted for being free-flowing.
I dynoed w/i 1-2 rwhp/tq with the cut-out open or closed.
I ended up cutting out my cut-out. Needed the ground clearance more than the noisemaker.

RedRallyeZ

iTrader: (20)

alot of the effectiveness is measured by how restrictive an exhaust you have, since youve got LT's , an ORY, and a pretty good flowing cat-back, then yours wont be as big a gain as someone with a stock system, biggest ive seen as far as gains are around the 10-15rwhp area.

but hte beauty of a cutout is that they are only like $30. get one and just see what happens. if you dont gain much then cap it and move on.

ChocoTaco369

The problem with that is the cutout could actually hurt him in this respect. The cutout causes the flow in the I-pipe to become crooked, and a capped cutout could hurt him significantly with the power a H/C setup can put out.

I think a cutout would be a big mistake in this situation. Your catback is basically just straight pipes. The cutout could actually be a restriction in your system and will do nothing but cause more interior resonance. IMO, it'll hurt you more than help you in almost every situation.

Hennytime

iTrader: (33)

on my cam only car, it hurts a little on the tq (until about 3500) but it feels like it gained alot up top. and **** lopes a lot harder and what not...mac mids/ory/hooker cb

NemeSS

iTrader: (127)

c/o is a good mod for stock cars, and minor bolt ons. may hurt moe built cars,
unless its positioned correctly and same size diameter of new exhaust plumbing, ihave heard of/seen big cube motors with h/c/i picking up power with c/o
so imo they work

Cobra Commander

iTrader: (12)

True, I was just wondering if I was leaving anything worthwhile on the table with this setup. It's at 440 NA and I'll be throwing a 150 shot at it.

Thanks for the replies everyone.

ChocoTaco369

I would say no. There's no real way of testing it either, because even if you were to dyno with the cutout opened and closed, since the Rumbler is basically straight pipes, the gains/losses could be chalked up to "dyno variance" as no car will dyno exactly the same every pull.

Agan, if you do add a cutout, it's going to hurt you when it's capped because it's going to put a kink in your exhaust flow. With it open, you may gain 2 or 3 rwhp up top, but you'll probably lose some torque down low. The longer exhaust tubes can actually help create a little more velocity down low, at least that's the way it feels for me.

A cutout, IMO, is just a "sound mod" when you already have a good performing catback, and in your case, all it's going to do is cause vibration and noise at cruising. If that's what you're looking for, go for it. My open cutout has been track proven to perform worse when open over my Corsa catback, but I run it open all the time because I'm 21 and love my car very loud and full of vibrations. Whatever floats your boat

slow trap

iTrader: (22)

on the spray a dual cutout would really pick your car up imo but on motor ite gains would be very minimal. i only picked up 6rwhp/10 rwtq on my 408 but i didn't dyno it without a cutout installed so tacobell ^ may be on to something about the disruption thing i have no clue on that.

TXws6

iTrader: (10)

hell yeah its worth it. I gained about 8hp on my dyno with the cutout open

TXws6

iTrader: (10)

and i highly recommend going Electric cutout if you do get one

MY99TAWS6

iTrader: (3)

Did you guys that see gainsw with cutout retune afr with it open to be optimal.I am wondering if it messes with the afr.
I seemed to be 2 tenths or so slower with my cutout open in some testing today on my timing instrument. I dont have all the mods in my sign on my car currently. I figure the cutout might work good when the twin turbos are on the car. It is a fun mod though. I have had three and like this make the best..expensive but seems to work good and not rattle when closed like the other two qtp and dmh.
This one is a street pro.

Houston999

iTrader: (3)

i had qtp cutouts gained about 14rwhp and 7 rwtq in back to back dyno runs. nothing changed but the cutouts was open. setup was pp ls6 heads 64cc g5x3 cam hooker headers y pipe and catback. all bolt ons the car made 441rwhp and about 410 tq without 90/90.

1320 killer

iTrader: (6)

it gave me 8 rwhp on the dyno

jrod98TA

i agree with most of these guys, but one cool thing is with a cammed car, you can run it open and sound like a strait drag car... lol, i do it sometimes and i love all the attention!

RedRocketZ28

iTrader: (19)

I don't see how having a cutout and closing it will make you lose power over not having a cutout at all. The exhaust will still find the quickest way out. I think cutouts are great. I had one on my LT1 that had only the cutout and CAI and it ran 13.8's consistently with horrible 60's on my part. Then I had a 99 Z28 with cutout and lid and it ran 13.3's @ 107 mph with 2.18 60'. When they are closed the car feels just like it was stock. I think that they help, albeit not too much, but they do. Also, the sound is nice. If you want to be loud and obnoxious you can be and quiet when you want to be.

99 Pewter TA

iTrader: (38)

I gained 7rwhp through the cutout, but as mentioned before you have great flow exhaust already.

mzoomora

iTrader: (36)

I was 10 hp higher with the cut-out open. I have SLP LT's, ORY and a SLP dual/dual.

BriancWS6

iTrader: (18)

I installed an electric cutout when my car had only bolt-ons and while I was still running the ORY setup with a Hooker catback. While I only had bolt-ons, I honestly couldnt tell a diff, and it gained like 6rwhp on the dyno.

Once I installed the heads/cam, it was a different story however. When I closed the cutout it felt significantly slower and less responsive. I then chucked the y setup in favor of true duals and a x pipe, and couldnt be happier. I have the sound and performance ALL the time.