Alright guys, here's the deal. Currently i'm running pacesetter headers into a 3" Y pipe into a gutted cat, and through an 80 series out the back. The car sounds alright, but I want something louder. Forgetting about emissions and the sound police, what would you all suggest. I was thinking about a ditching the cat all together and setting up a single chamber flow and dumping in before the axle. Suggestions???

 

If you want all out loud, then I would go single chamber too, unless open headers are a possiblity.

 

CUT OUT.

*LOUDEST

*CHEAPEST

*BEST FLOW

 

yeah, but with a cutout i won't have any backpressure. Thats why i was looking into the single chambers

 

You do not want any backpressure.

 

Yeah you want backpressure!!! 100%! To think, you can pass emissions too!
:sillylol:

 

Are you kidding me?

Stop reading super street.

 

Why don't you try a glasspack? They are plenty load and get louder the more miles you put on them......

 

I want my car to sound louder, but i heard that glass packs make them sound like white trash. I'm still not sure what i should do, but thanks for your input guys

 

Go for the SLP Loudmouth.

 

How true, HOw true.

Backpressure, ahhhh, when will the world learn?

 

i had a glass pack where my cat was sopos to Be and It really did sound like Crap..... I drove around with that Thing for about a half a year than got MY real Exhaust .....

But if you want Loud that does it .......

 

my settup is flowtech full length headers with purple hornie glasspacks from flowtech that are bolted directlly to the headers, then i put turn downs on the end of the glasspacks, loud as F***, and at idle they growl at you, its a sick sound, makes it better with my real lopy idle canm i got in my 350

 

O.K. forget what everybody is saying. Backpressure- yes, you do want backpressure. Glasspacks- No you don't want glasspacks- will rot out and get extremly loud over time. My suggestion is to go with a 3" setup, with no cat, to a Spintech race muffler, dumped out before the axle. The Spin tech (3" inlet and 3" outlet) will give you a loud exhaust note, and a nice rumble, why? Cause it's a race muffler! The only drawback to this setup I can think of is that if your car sits low, you may have some ground clearance issues. The flowmaster is good for sound, but I've just heard the Spintech will give a better flow, (sound is good here too though.) E-mail me at Erwk@msn.com if you have any ?'s -89IRO

 

Keep believing that.

You don't want backpressure. Sure go ahead and stick a potato in your exhaust that will give you some.

You're confusing it with the scavenging effect. Backpressure is due to a restriction . This has been brought up in the past, PM five7kid, I"m sure he and RB83L69 can explain it a lot better.

There's a reason why open headers are preferred.

 

Headers Make Enought backpressure So you dont need to warry about it ......




By the way my Exhaust is not loud untell you Get on it I love Flowmaster ....

 

Umm, ok... Not as much as manifolds.

 

hahahaha Very True lol


Hey dont for get that y pipe all so makes backpressure and anyways you really dont want it thats whay PPL have Free Flowing Exhaust sytems.......



sorry if my spelling is bad Its 2am where im at lol and Im really Tired......

 

Hey "Mark A Shields," I hate to break it to you but it's torque that gets you down the road and without a little back pressure you're not going anywhere! Just trying to help you at man, you asked for a suggestion, and I gave you one. You don't have to be a dick. -89IRO

 

I wasn't tryin to be a dick, just tellin the truth.

And torque doesn't get you down the road, it gets you off the line, HP gets you down the road. Well sort of.

 

HOLY CRAP

Open headers provide more than enough "back pressure" on a lightly modded 350. If you decided to run open heads (no headers/manifolds) THEN you might have a problem.

X ELEVENTY BILLION

 

When are we ever going to learn?

"Backpressure" is never good. Pressure on the exhaust system means the pistons have to use some of the power they've just generated to expel the exhaust gases. That's not good.

Pulse tuning is what it's all about. It's been discussed so many times in the past, I won't go into it again (unless somebody really thinks it needs to be again).

Where's that automatic slapper for people who claim, "You need backpressure"?

 

I never said you want a ton of back pressure. But you won't make any kind of power with 0% back pressure. You need a little in order for the exhaust gasses to be quickly pushed out. So if you say you want absolutely no (0) back pressure, you don't know what you're talking about. -89IRO

 

Again read the above reply before your post. You don't want any BP, but you're confusing with the pulse of the exhaust gas.

From RB83L69 "That one always gets 'em going...

You're right, back pressure is not "needed". It is not helpful in any way. The deal is, without it, the engine's fuel and ignition timing requirements are altered, because the cylinders are more completely scavenged; once these needs are addressed, the improved flow will always result in an increase in output at all RPMs. "

 

Wouldn't 0 backpressure be impossible though? Like having an engine with 0 friction or something....

 

roflmao..you guys are great :lala:

 

Hey, Hg- you know what I mean. Of course it would be impossible to have 0 backpressure- you missed the point. -89IRO

 

No, it is not impossible to have zero back pressure. In fact, it is possible to have less pressure at the exhaust valve when it opens than what the atmospheric pressure is at the exhaust opening. That's what pulse tuning is all about.

Look, guys, by the time you get to the y-pipe, it's all over. You want it to be as free flowing as possible from that point on back. This "tuning" all takes place in the first few feet from the port. After that, you're not tuning the exhaust, you're routing it away from places it'll do harm to health.

If there is any ill effect from reducing back pressure, it's because the induction system was tuned to the exhaust system with the back pressure there. When you reduce it, you can lose power if you don't recalibrate the induction.

 

Couldn't have said it better myself.

 

Finally someone who knows what he's talking about.

Stop wasting your money on cat-backs and get a cut-out right after the Y. I guarantee I outflow ALL 3" catback systems with my cutout uncapped. I picked up 5 tenths and 8 MPH by installing my headers and cut-out.

 

Yea tuning is pretty much done in the exhaust manifold or header. You vary the length of the primaries to maximize power at the desired RPM range.

 

I think I will post some Q&A's from Holley and Hooker....

What tube size do I need and is bigger better?

Header primary tube sizes vary on many factors: engine combination, transmission type, gear ratio and intended use of the vehicle. For example a truck header will be designed using longer length and smaller diameter primary tubes to enhance low to mid-range performance, where a header for a Pro Stock race car will have larger primary tubes and large collectors for the highest flow available.

Bigger generally is not better when it comes to street driven cars. when you put too large of a header or exhaust on a street driven vehicle, you usually notice a severe drop in low to mid-range performance due to a lack of backpressure. To combat this issue, Hooker sometimes builds 3 or 4 different headers for a particular application with varying tube and collector sizes.

To sum it up in a nutshell, it depends on everything.

 

Got an issue of Hot Rod right here. It's about the LS1 Techno TA giveaway... They removed the cat-back and dynoed it. Then installed a 3" Flowmaster system and dynoed it. The car made MORE RWHP WITH the Flowmaster system than the open y-pipe.

 

Hmm. More magazine quotes. Hey, BTW - who do you think is a MAJOR advertiser for Hot Rod Magazine?

 

And every cop within a 50 mile radius. Since he is interested in a "louder" or better sounding exhaust we should assume he is running on the street.
Also before making an exhaust system that exits in front of the rear wheels, check your local laws. Several states have outlawed those kinds of exhausts and carry a heafty fine when caught running one.

 

five7, Mark, and others......... what is it with these people!!!...... You explain it to them and they still don't listen......

 

Magazines are also a waste of money. If you really think backpressure helps, roll your issue of Hot Rod up and jam it up your I pipe because that's all it's good for.

Listen good:

If your car picks up HP with a cat back it's because your primaries are TOO BIG. While we're talking about wasting money, for the record SLP 1 3/4" primaries are also a good way to burn your cash unless your in the range of 500HP. While your at it, you might as well pick up some of those quad-tip spark plugs... because 4 has to be better than one right?

On the other hand, cut-outs are only for people serious about racing. I would never recommend them for "street racing".

 

backpressure is the enemie people, and there is an odd ocurance that happens that causes exhaust gas to exit faster at surtain rpms but everyone mistakes it for backpressure when its the vibration from the engine going down the pipes hitting the muffler or cat and coming back to remove more exhaust. Its hard to explain but thats the best way I can say it. but backpressure is BAD PEOPLE BAD! All the ricers crack meup, "oh *** we need back pressure!" lol. Alost cut outs people, best invention next to sliced bread.:rockon:

 

ok and now back to the original question
I have hooker headers no cat 3" pipes all the way back with a dynomax super turbo 3" in 3" out and thats loud enough that everyone who has been in my car said it gives them a headache, not sure how loud you want, thats just my .02