I would say cutouts just move power band more up top. I definitley notice more power at 2,500 rpms with the cutout closed than with it open. but at wot i notice more power with the cutout open.

i also get around 2mpg worse with it open, all interstate driving.

 

That is DEAD WRONG. Keep telling yourself that if it makes you feel better. I suppose the drag cars that are LS1's all have mufflers and duals ran out the back.


You may lose a little powe down low, but the gain up top where you need it if you are racing will make up for it.

 

I don't think it's enough of a difference for me.


To have a loud *** exhaust all the time.
To scrape on every speed bump driven over.
To win a dyno shootout for torque below 3,000 RPM's

I'll stick to enjoying having a really quiet........to loud as hell exhaust in 5 seconds.

 

You seem to be comparing a all-out drag car to a normally operating ls1, let me say I don't think this is a good comparison for the following reasons:

1). An all-out drag car makes it's hp in the UPPER rpms, much different that an ls1, relatively speaking. We're talking over 7-9k rpm here, minimum, so you can't really compare it to the design of an engine that has an operating range of 2-6.5k rpm.

2). A all-out drag car doesn't need to have mufflers and piping, just not required with their packaging constraints. So even if it was no hp loss to run true duals and mufflers, they don't need to do so.

but most importantly,

3). We are talking about ZERO-backpressure systems. A cutout runs with Zero backpressure, that's how it makes a handful of hp more than a catback system. But so does good designed True Duals, run at ZERO backpressure. so their top-end hp potential are the same. HOWEVER, a cutout can't scavenge, therefore will never make as much power as true duals, unless the engine is designed to operate in that range (see above reason).

 

You seem to have a few misconceptions my friend, when talking about GOOD DESIGNED True Duals:

1). They are no louder than having a catback on a regular car, when run out the back and through a full-size muffler, like the Bassani system or a custom one just like it, a preferred configuration of those who are after duals that are refined.

2). They don't hang any lower than a ypipe system, if designed and built WELL, which you should pay for if you are getting True Duals.

3). They don't make tq below 3k rpms, they make more tq right in the meat of the powerband, as is proven my my dyno graph (and others) when switching to true duals from a ypipe configuration:



4). IMO cutouts sound like *** definately WORSE than a fantastic sounding True Dual Exhaust system (which is music to the ears).

 

And the true duals cost accordingly when you're talking about all top-quality items. It's a commonly accepted trade-off. No need to take it as your personal crusade.

 

Just want to make sure all the facts are straight, for people who are reading and learning about True Duals for the first time. I can't stand WRONG data spread as gospil on the net because people are uninformed of the FACTS.

 

LMAO!! i couldnt have worded that any better myself! that is my main goal with my cut out lol! I LOVE IT

 

Hey lsx24, what mods did you have done when you dyno'd?. with a UD pully, Lts, ory, magnaflow, slp lid, and K&N i made 338hp and 366 tq

 

Most of the mods are listed on the graph, but I had pulley, ported ls6, TB, JBA shorties, carsound cats, Bassani Tru dual exhaust.

The before-run was with stock cats and ypipe, with Magnaflow catback.

 

o cool. im getting my car dyno'd in march sometime i believe. this time i will have my ls6 intake on, cut out and a tune, i will see what the difference is with the cut out(s) open/closed

 

thanks

 

Is running an open cutout all the time bad for your engine? Since there is little backpressure. I know there seems to be some controversey on this issue but im not sure. Also, how does it affect your gas mileage?

BTW, this is with stock maniflods and y-pipe.

 

Once again. It is not about back pressure. Lots of people run cut-outs all the time. You will lose power and tq due to the lack of presence from scavenging and velocity.

Why is anyone worried about getting bad gas mileage. That is almost a sacrifice for power. I didnt buy mine for the gas mileage.

 

How will a catback and crossflow muffler on a y-pipe system increase performance over a cutout in the I-pipe that is being scavenged by the vacuum caused by air that is blowing by it? I can't see how my muffler allows any scavenging. I would think all the scavenging of that system takes place at the "Y".

 

yeah a cutout was my first mod also, and i did it just for the sound. Im not sure how much power i gained but it feels faster, probley since its louds.

But its still not loud enough, im hoping headers and ory that i just got will solver that problem

 

I'm running a e-cutout/Stock TA Exhaust on my H/C setup. She's idling a bit high right now (950/1000), but with the stock exhaust you can't tell anything is done to the car. With the cutout open it's a different animal all together, it just screams "FEAR ME". She pulls ALOT harder up top with it open, though i swear it's going to make my ears bleed. I love it, best of both worlds... For 200 bucks, not having to crawl under the car every time i want it loud is defiantly worth it in my book.


I'm going to have it re-dyno'd this spring, numbers below are though the stock exhaust and stopping the pull @ 6K. Can't wait to see what numbers she put's down w/open cutout screaming @6700 rpm.

 

Plus, it is the fun factor. Being able to sit at a light with the cutout closed, then open it a little bit, then close it and to watch the look on peoples faces as to what just happened!

 

Ive heard problems with the elec. cutouts leaking. I would like to buy one but am not sure if it would do its job. Anyone have any problems with them? Also, which e-cutout would yall suggest?

 

Haha, the "WTF" look is defiantly a bonus!

I got a DMH, 4 year warranty is nice.