What kind of difference does a Exhaust Cut-Out make for performance & sound? I know it's louder but is it a good louder?

It will give you a performance boost, all the cutout is doing is making it so you can run no exhuast at all(after the headers/manifolds)

Sound better? that depends on what you like, but I know the police will be more than happy to ticket you if you are running no exhaust.

Or you can get the electronic cutouts and open and close from in the car, or open 1/2 way to tune the exhuast to what you like. And If you get pulled over, simply close it to make it quiet again.

You sound like you are speaking from personal experience!

Where would I find an electric cut-out?

http://www.mccordcg.com/mpp/mpp.htm
www.quicktimeperformance.com

Thanks. Has anyone dealt with either of these companies before?

I have the McCord Version...I absolutley love it! It's the loudest thing around here....sounds like a NASCAR going down the road. IT's great because I can set it anywhere I want. I do have to say though....it sounds tons better with headers instead of just the stock manifolds. Louder...and deeper. Here is a picture of my set-up..

and my switch panel

Exhaust cutouts truly do have thier place. However, if you are running no cats or a gutted cat then save your money and just install a really good straight through muffler like a Magnaflow or a Dynomax UltraFlo Welded. I put a straight through Dynomax UltraFlo welded muffler on my car and it is QUIETER than my flowmaster. Then I proceeded to go 11.6's @ 117 through that same 3" exhaust.

http://www.celligent.com/tim/iroc/exhaust/muffler/

Tim

I see what your saying TRAXION, but it's really cool to have the best of both worlds.....I have a full length exhaust system....which sounds loud..and great....but when I dump it....it sounds like a NASCAR going down the road. It's just cool to have the best of both worlds.....even though....I have over $1000 in the exhaust on my car

my eventual plan is to get one... i may even get dual McCords..

im going to be trying to use them to my full advantage... meaning im going to make the exhaust muffler do its real job...... keep my car quiet....

when i want to be loud, i still have that option.... heck, if you just crack them open, you can kinda adjust the volume even...


the goal here is to have a car i can drive past a doughnut shop without anyone looking... i can talk to the girl next to me in the car.. i can hear my stereo clearly even with the volume set low...


yet when i want to be loud, or rev the motor or whatever, i can...


this is one of thoes lil detail things id love to have... hopefully soon.. :lala:

Right now I have a hi flow cat and flowmaster and I would like it to be louder.

I would put a cutout infront of the cat, however, at the track I race at, racing is from 8pm - 1:30AM, and after 10pm, they go to a decible limit of like 90, I don't think the dec meter would like me with a cutout. I'd just be running through the cat again.

So what I'm going to do, is remove the cat and flange it, and put in a cutout in with the same flanges and a length of pipe to make it the same length as the cat. Then get an electric cutout.

Thus I get the full benefit of a cutout when I want, plus I don't have to worry about my cat when I'm at the track during those later hours.

Flanged cat so that I can pass emissions when that time rolls around. Bolt it back in, then back out.

Easiest way.

I like my cut-outs, but they're too loud to have uncapped when cruising the town. I take them off when I'm coming home from work (the guys at my work love that) or going for a drive in the country where there aren't any cops. Generally I think they're good for about .1 in the 1/4 if you have a fairly free flowing exhaust.

I gained 21rwhp and 8rwtq in second gear on the dyno by opening my cutout. That would be about equal to 25rwhp and 12rwtq in third gear.

Mine is before the catalytic converter.

I'd say its worth it

here is an idea that i might do.

How much power do the cutouts rob when they are not open? In other words, an exhaust system with no cutouts is going to produce more power than a system with cutouts that are not opened up - considering the extra turbulence the cutouts create.

from what ive been told by the guy that runs the dyno at a local shop, that has such a little effect that he cant even see it on the dyno....

we had a nice lil chat about this and other things on a free dyno day one time..

what did he say about open vs closed?

That's what I'm talking about.

I find that hard to believe.... if you have cutouts and you uncork them right after the header, there is no way it wont make more power.....

read what i quoted and responded to... then read what i said.

CLOSED they have almost no ill effect... none thats measuable anyway


thats what most of the conversation was about... according to him, alot of the street cars with catbacks already see no real diff, only a HP or 2 according to him, but the faster cars (modded LS1s, big blocks ect was what he was refering to at the time) seem to respond rather well to it.... 12hp or so.... according to him its nothign huge but its more the louder sound makes yuo think its even faster

i kinda agree... *shrug*

to me.....it dosen't even matter how much power they may or may not produce. I just got mine..with the McCord for ****'s and giggles....I wanted it loud...so I got it.

thats kinda why im getting mine...

i know im going to want it quiet somtimes, and a good muffler is how you do that..

but every once in awhile i want that big cammed open header cackle to scare the crap out of the person next to me..

i figure it cant hurt either... hehe

Not cutout related, but something to consider about exhaust.


Dyno 300RWHP 440 dodge, with dual 2 1/2" pipe... but over the axle it smushed into 2 1/4.... but its still two full pipes right?

Well in Car Craft this month, they put on a DUAL 3" mandrel setup with flowmaster mufflers.... Saw a gain of 52RWHP moving the peak up from like 4300 to 5200ish. Even down low the numbers were better.

SO here we are with 305/350s whatever, if it's something modded Other than exhaust mods (though headers help) and you put a cutout on it.... I bet you'll see more than 12hp for all our HSR, SR, Miniram, or even just Cammed TPI cars.

Stock, you'll see like 12.

Makes you wonder how good that 3" single pipe is? Better than factory, but to potential? Hmmm

I'll open up mine for ya' at the next gathering

*looks at the displacement of the motor*
*looks at the 305*
*looks at the power outputt and VE of the dodge*
*looks at the 305*

yeap....... it would be absolutly stupid to compare the two.

I second that!

Damn I just love my cut-outs. I love the nice mellow sound my hooker exhaust gives me, but then when I flip the switch. I just hear my loud a** exhaust and can't get enough of it. Though be careful with the cops they tend to sneek behind you, and catch you off guard.
Peace Out,
PsychoGTA:lala:

Amen brother! I'm with you on that!

How are the electric cutouts controlled? I mean, do you hold the switch closed then open it to stop the cutout where you want it? Is it a three position switch (Wouldn't it have to be?)? Does it stop automatically when it hits it's open or closed position?

You just hold the switch until it's as open as you want it. They are contolled by a motor, not a solenoid. One of the websites above (i don't remember which) that i posted has a little movie of one in action. it takes a couple of seconds to open it fully, so you can stop it however you want.

::cough:: 3" pipe good for 400hp :: cough ::


That's what you TGO people say all the time.

I was just pointing out an example of something different in what a free flowing exhaust can do.


BTW Backpressure = bad

BTW, how can you compare VE between the two motors, between the two VEHICLES, between THEIR RESPECTIVE POWER OUTPUTS, Not to mention the whole carb vs FI thing.

Stick a 305 in a dodge and watch it not move very well. Gonna tell me it's gonna have the same VE? Doubtful?!

Stick a 440 in an f-body and watch it fly.

regardless of what vehicle it's in, it will still have the same VE. Do you know what VE is?

I still think it's only too an extent. I was comparing Horse power to exhaust system, I wasn't compairing engines.

yes, regardless if it's pulling a 3,000 pound car or a 5,000 pound truck, it will still be pulling in the same amount of air and fuel, etc. Explain why it would change.

Explain why it would need a bigger exhaust in something else then?

Why don't we just leave our cast manifolds and stock exhaust on, if breathing more than stock is better.....

I guess I was thinking more of a true EFFICIENCY thing rather than a term.

Thus some small blocks get better milage (bigger cubes) in something like an s-truck over the stock 2.8.

huh

yes, because they don't have to be pushed as hard. Think about it. If you have a car that weighs 3,000 pounds and a car that weighs 5,000 you wont have to push the gas pedal down as much on the one that weighs less to get up to speed. Therefor you save fuel. But the engine still has the same VE regardless.

Hooray for being ridiculed for posting some information that might be useful to someone like this whole place is supposed to revolve around.

Forget Ve, but that's what I said is what you just repeated.

So why are we comparing VE of a 305 and it's exhaust to a dodge 440 and it's exhaust, when all I was doing was showing an example, something that was done.

chill out man. Nobody was trying to ridicule you. I was only trying to explain myself. The huh was because I didnt understand the point you were trying to make.

Sigh...

in the closed position...the light is on. When you push the switch (holding it) the light will go out...(still holding it) when the light goes out, the cutout is fully opened. It works great

Check the classifieds .

I need to keep my Cat for emissions. Does anyone have a pic with a cut-out and the cat, I want to put the cut-out in front of the cat.

Here's mine -

It looks like you had to jerry-rig it to get it in there!

Not really. Just cut an oval hole in the Y-pipe, then flared out the metal so I had something to weld onto