Would it adversely affect the performance of my car if I just run my headers from the y-pipe. Nothing else attached?

I will eventually get a cat but I want to install my 2055's before my spring break is over this week, i have alot of free time this week so naturally i wanted to install them.

But will it affect the performance of my car at all by not running anything from the y-pipe?

How will it affect the AIR system?

 

anyone?

 

The car will run fine. And be very loud.

 

the car will be super loud and have no backpressure. it will feel like you lost TQ.

 

So it will feel worse if i do it than the stock exhaust manifolds that are on it right now? (performance wise)

Honestly how much louder could it be? I run mine right now everything stock with just a cat, no muffler, the cat really muffles the sound that much?

 

When i did my 2055 i ran the car around the corner with just headers and y. There’s no way i could drive it, its load. o and it stinks to

 

That would be wrong

 

I don't believe in backpressure to cause torque loss....even if so...the power gained makes up for torque lost.
I would still run a muffler, with mandrel bent exhaust system though....here are some flow numbers of mufflers vs. straight pipes to show you which flows the best...

This is a chart of popular performance and a few stock type mufflers I have tested on our flow bench. These were all the most popular mufflers sold and installed at a local exhaust shop. Straight pipes have been tested and are used to compare these mufflers to "potential" flow of a muffler. When running a performance muffler on the street there are many more things to consider then just good flow. For instance pleasant tone and enough sound reduction to avoid any "unwanted" attention from local authorities. One thing to keep in mind is how restrictive tailpipes are. You can have a great flowing muffler but if your tailpipes are restrictive you may not be getting any gain from loud, high flow, and not to mention sometimes "expensive" mufflers.

 

Do you mean loud? You could definitely tell a difference between stock though right?

Well maybe i'll just hook them up and not drive the car until i get the money for a cat, i'm gonna drive it with just the cat, that's how i drive my car and it seems fine.

Damn, i want to buy a cat/catback, but i just don't have the money, i have some stupid failure to stop ticket for $255 that is due by may 22 that i have to save up for.

 

You might get a noise ordinance violation too with open headers....it'll be real loud but if you had a good cam it would sound even better...

 

wow, this really does put it in perspective, does a backpressure supporter have anything to say about this?

I'm not sure if i'm even in the neighborhood of being correct but i think i've heard something like backpressure is considered beneficial in small doses in the sense that when the exhaust waves/pulses, w/e they are, bounce back in the exhaust pipes from whatever the restrictor if flow may be (cat, muffler) it creates a slightly lower pressure area than that of the exhaust rushing out of the cylinder, and in basic physics or which ever branch of science it is high pressure always rushes to a low pressure area (when it can), like when you're piston is taking air into the motor, at BDC it's created a low pressure area and when the intake valve opens the high pressure air from the atmosphere rushes into the low pressure area created by the piston.



maaan, look at the difference between the hooker aerochamber muffler and the max flow, the same inlet/outlet but almost 200 less CFM in the aerochamber, that's crazy.

 

Why would you run a muffler with mandrel bent exhaust? Is it bad for it to run it without one?

If anything i'll just run a glasspack, cheap and loud, so i hear.

and i read in one of those LO3 articles that float around on here, the ones about hopping up the LO3 into some beast that contends with 350's and whatnot, that regardless of horsepower, the car with the most torque wins, so if you say the power gained makes up for the torque loss, according to that article, it still would be slower than one that perhaps had less power, but more torque?


Thanks for your hep guys.

 

You are very correct.......your going to get backpressure from the exhaust piping itself let alone the muffler.....backpressure to me says "restriction"......but that's my experience and opinion of course.....as far as the sound waves/pulses, you the first person beside myself that has posted this that I've read.....Most people think it is just exhaust air flowing out, but don't take into consideration the sound waves and pressure areas and such.....very smart....
As far as the aerochamber and max flow go...I personally really really wanted a maxflow, but they only go up to 3" and I run 3.5"....so I run an aerochamber....but IMO if you could run a max flow I would.....hooker takes into consideration pressure, waves, not just sound.

 

Check out the chart though....the glasspacks flow horrible, I don't know for sure why, they are pretty much a straight pipe...but anyways...somewhere else I have a horsepower test on different mufflers, and again the max flow actually produces more power than straight pipes did....I'll try to find the numbers for ya.....

Correct that torque moves the car......but here is the difference....horsepower is derived off of torque....when you subtract from the torque, you can add to the horsepower...in other words your moving the powerband from the bottom end of the rpm range towards to top. Let's say you have a torque motor, like a stock tuned port, lots of power on the bottom end, let say below 3000rpm.....and you have a similar motor but put a HSR on it and a different cam that moved the powerband up....now the new motor makes less torque than the stock one, but more horsepower......in a race, your usually turning a lot of RPM, let's say you shift at 6000rpm, and are always above 3800rpm...which motor will pull ahead...the one that makes torque down low (you'll be out of your powerband), or the one that makes more horsepower up high, where you in your powerband. The most torque doesn't always win..... hope that wasn't too confusing...

 

ahhhh, that makes complete sense, but which is usually more valuable? bottom end (torque) or top end (hp)?

 

Is this the max flow muffler?

http://www.jegs.com/i/Hooker/520/21605/10002/-1

 

It depends on what your using the vehicle for.....I like the torque personally, the feeling off a stop light is great...but a drag racer might like mostly top end to get down that track....my car is set up mid to upper range powerband (i do road course racing). Upper end horsepower is more usable I think.....when you on the gas, you motor is usually in the upper rpms rather than down low....
And yep, that's the max flow.....it's smaller than say a factory muffler or a flowmaster crossflow, so you'll have to fab some more pipe in, but it's easy....let me get some pics of mine installed here for ya....

 

Here are the pics of the exhaust...sorry not very good, just ran under it and took some quick pics....but one is the front near engine.....one is the middle facing back (notice the Y, no cat) and the last is behind the car on the passenger side (notice pipe turns into muffler, no tailpipe on right side...it only exits on left).....I LOVE this muffler...and you know I'm coming...not quiet like it used to be with the flowmaster....this one is very deep and noticable....sorry I don't have any way to record sound.

 

Also, I built this exhaust for I think around $200 (if you have a welder and a cutter)....the whole thing is mandrel bent. What I did was bought the muffler new $67, bought 2 boxs of 'flawed' mandrel bent bends on ebay for $25 each (if you look at rear pic showing muffler...the 90 pipe right before entering muffler, right before weld has some scratches on it, that's what they considered flawed, SCRATHCHES!! I don't care about scratches myself) and also I bought a couple straights sticks of pipe that was around $25. Little stuff like hangers and what not too, but spent 3 days building in garage....didn't spend a dime on labor, except some pizza and beer. Anyways, that's my exhaust to give ya some ideas.

 

I'm gonna be getting this cat
http://store.summitracing.com/partde...5&autoview=sku
it's a slip fit, that means it just slips on? no welding required?

and you've convinced me to get a hooker maxflow, i called a shop today and got quoted at about 65 bucks for them to put on some piping to go from the cat to the muffler (the muffler that i supply)

I'm don't quite understand what you were saying about fabricating pipe on the max flow muffler 91.

Man, your exhaust looks good, i wish i could do that myself, it's just the lack of equipment on my part.

 

I dont have to pass any emission/safety tests due to living in South Carolina so my solution is to remove the exhaust pipes, install headers, then bolt some cheap header mufflers to them and drive away in my hot rod 305. haha=)

 

lol, you're truly a lucky man, i'm over here in california with the smog ****'s, my car is completely stock and it failed the sniffer test, i had to pay some shady guy in East LA 150 bucks to have it "work the numbers" and pass it, dunno what he did, all i know is i got my car back with the fan running full blast, so he fooled around with something, i don't care, as long as my car is "legal".