73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Exhaust => Topic started by: exilous on April 23, 2009, 09:07:33 PM
-
Ok I am scoping around for some ideas for my C30 Project when I get to the exhaust section. I like planning very far ahead and the exhaust is a few weeks off in the distance. Either I'm going to go straight pipes from the manifolds to a set of muffles just behind the cab, OR I've been talking to my buddy who has an exhaust bender, and I'm debating whether I want to go straights off the manifolds bend up between the back of the cab and the headboard of the dump bed, and cut 2 holes in the top of the head board and make it like a big rig with flappers and everything. Seeing as how the new trend today is having big rig exhausts on your little rig pickup I figured I'd put a cool spin on things. Spice it up a bit.
Any ideas? Suggestions? I'm open to it all.
-
It's personal taste. I'm not a fan of that design and prefer the exhaust exit at a 90° after the axle myself. Flowmasters have a nice tone but if you want different try some other mufflers. Summit has a lot to choose from.
-
i dont know if you can find a way of doing it but i wanted to put duals coming out in front of the back tires but i couldnt becuase i have dual gas tanks and they were in the way, for mufflers i would personally go with flowmaster ive always liked how they sound, but i guess magnaflow sounds pretty good and you could also try some turbo mufflers
-
Favorite is Dynomax followed closely by Mangnaflow.
-
Favorite is Dynomax followed closely by Mangnaflow.
What about Pypes Race Flo? Same design as Dynomax UltraFlo.
-
I honestly haven't use anything except Pypes StreetFlo. I liked them too.
-
I've got 2.5" duals dumping in front of the tires on my 79. Flowmaster super 44's have a super crisp tone thats hard to beat. Dual tanks is not an issue with the exhaust.
-
Favorite is Dynomax followed closely by Mangnaflow.
I'm a big fan of Dynomax. I replaced my Flowmasters on my car with Dynomax.It still sounds great, just a little less noise. I will probably do the same with my truck. Flowmasters are just a little too loud for my taste.
-
I personnaly like the sound of flowmasters, I have mine dumped in front of the axel and it sounds great. The dynomax muffler is also a great sounding muffler with less noise.
-
Well I am running Flowmaster super 40s on my Hemi flavored dodge and it sounds nice. A great tone. Another question I have been doing some research in headers and looking into actual tuned headers not those crappy headers that fit and don't really do much. I came across something called "tri-Ys" and they have a great look to them and I asked around and a few mechanics I know say the are excellent headers, a bit pricey but the give a great range of power in all aspects. None of them knew whether or not they would fit on my truck I would assume they would. There is nothing special 2wd C30, 350 mated to a sm465. So While I was looking I couldnt really find any big name sites that sold them just smaller sites adn i don't really trust those smaller sites just because. Anyone know of any other places that might sell these Tri-Y headers?
-
Doug Thorley Tri-Y's are what I run on my truck. They are excellent for stock to mild-performance motors and more compact design for a better fit. They are probably best reserved for engines with less than a 270° (@ 0.006") duration cam. Above that, it's best to go with a good 4-1 header or peak horsepower can suffer significantly. (This is based on advice from David Vizard found in this book (http://www.themotorbookstore.com/how-to-build-horsepower.html))
Unless something has changed, Chris is a dealer for Doug Thorley.
-
Do they make much of a sound difference?
-
I put them on a 79 K20 350 a few years ago and had to grind them around the spark plugs to clear and the welds on the pipes were an ugly touch too so I was never a fan. Chris said he tried a set recently and loved them so I guess they've improved over the years. Let him chime in
-
I run Flowtech-style headers on mine with dual 2.25" exhaust, H pipe and Dynomax Ultraflos exiting to 3x18" Magnaflow slash-cut tips that are at a 45 or so behind my rear tire. After I did the cam and head upgrade, my exhaust got a fair bit louder. The Ultraflos are nice and give a pretty classic performance muffler sound. They don't drone as much as a Flowmaster I had on a different truck years ago and really 'snap and rap' when accelerating hard above 3500 rpm. I want to try Hooker Aerochambers though if and when I eventually upgrade to a full 2.5" dual exhaust.
-
Well since I'm new here still I don't know peoples names so I dont know who chris is. haha
-
Chris is Captkaos - the owner of this site.
-
Sorry about that. Like he said cptkaos
-
Ahhh ok very cool.
-
I wouldn't say Loved them, but the headers were nice pieces. I did have issues with the crossover pipe on my 4x2, but I finally got it resolved. I still sell them, but they are not cheap.
-
I know they arent cheap I found a couple sites that offered them varying in price range from 625-825 for pretty much the same exact set. Either way I won't be doing any crossovers my friend has an exhaust bender and I will be doin true duels. Still debating whether or not to do the smoke stacks through the headboard of the dump body. it would definetly look cool. I'd have to do a few measurements to make sure it doesnt burn up my tarp. that would be bad.
-
For performance? I pick this one
(http://ecx.images-amazon.com/images/I/21DbgLZsavL._SL500_AA280_.jpg)
-
If you know the Part number of the headers I can look at my cost for them.
-
Mine are the 300Y-C, which are designed for straight dual exhaust. They fit great.
-
I run Flowtech-style headers on mine with dual 2.25" exhaust, H pipe and Dynomax Ultraflos exiting to 3x18" Magnaflow slash-cut tips that are at a 45 or so behind my rear tire. After I did the cam and head upgrade, my exhaust got a fair bit louder. The Ultraflos are nice and give a pretty classic performance muffler sound. They don't drone as much as a Flowmaster I had on a different truck years ago and really 'snap and rap' when accelerating hard above 3500 rpm. I want to try Hooker Aerochambers though if and when I eventually upgrade to a full 2.5" dual exhaust.
How do you find those headers? I've got a set in my garage waiting to go on did they make a big difference to the sound...? I'm going to be running a dual system with an H pipe also, but 2.5 inch up to the muffler then 2 1/4 after.
-
I find them fine but I don't really have anything else to compare to since I bought them with the truck. They seem to fit fine and are holding up well. They don't leak, even after being removed and reinstalled when the cam and heads were done. I don't know for sure if they are Flowtechs though. They just look like a pic that was posted that were Flowtechs.
-
Capt I dont have a clue which ones I would use... something that fits. I have a pic up of the engine and trans on the frame where i have been posting my project i odn't know whether long tubes or short tubes would fit and what would the benefit be to either length?
-
Ok i did some research and found a set of doug thorley tri-ys on jegs. the number is #776-D310 here is the link.
http://www.jegs.com/i/Doug%27s+Headers/776/D310/10002/-1
-
Dougs headers aren't the same as Doug Thorley. Those are full length just like my doug thorleys, the primary tube routing is different; also the collectors on mine are 2.5". Nothing wrong with them, I just thought you should know that those aren't doug thorleys.
http://www.pertronix.com/prod/ex/dougs/default.aspx
http://www.dougthorleyheaders.com/
-
Oh I didnt know there was a difference...thanks for letting me know. But is there a difference between the two? Like I would assume that doug thorley headers would be the big company and dougs would just be a cheaper version of the real doug thorley headers? Or am i assuming wrong?
Ok then these would be the ones I would assume I need from the doug thorley site. # THY-367Y-C
http://www.dougthorleyheaders.com/products/searchType/vehicleSearch/year/1985/make/CHEVY%20_SLASH_%20GMC/model/TRUCK/sfID1/9/sfID2/40/sfID3/33/productID/789
-
The TH-367Y is a mid-length design with a y-pipe. Chris is using a set of these on his Jimmy project as it will have a single exhaust and he had some issues with the fit. The doug thorley equivalent to the Doug's 310 you posted earlier would be these: http://store.summitracing.com/partdetail.asp?autofilter=1&part=DTE%2D300Y%2DC&N=700+115&autoview=sku
They are what I am running and they fit great. As far as the comparison in quality, I don't know if one is better than the other.
-
OK caus what I'm going to be running on my truck is true duels my friend has a bending machine so I can bend whatever I want. And I heard my dad mention something about Tri-y headers a long time ago being real good and stuff so I think I would like those. They say they are for mid range power which is what I would need in my truck. Those ones you just posted aren't tuned though. SO I should stick with the ones from the doug thorley website then?
-
I really don't think there is such a thing as an off-the-shelf "tuned" header for a SBC. And if it is "tuned", for what rpm range and on what engine? Header tuning can only take place on a dyno for a specific engine and it is very involved. Let the professional racers worry with that. Any good off the shelf header will work for a SBC in a street application.
-
Ok, cause i've seen some that say tuned and some that say they arent, i just assumed tuned headers were matched tube lengths for opposing sides of the engine and stuff.
-
The TH-367Y is a mid-length design with a y-pipe. Chris is using a set of these on his Jimmy project as it will have a single exhaust and he had some issues with the fit.
I am attibuting my fit issues with the fact that I think they sell the mid/Y setup like on my Blazer for all Blazers and didn't test fit them on 4x2 Jimmy/Blazers like mine is.
Originally Doug Thorley Headers was the Original company ran by Doug Thorley and family. A few years back he divorced and she retained the rights to "thorley" but couldn't use his name, so...
Dougs headers was created which was ran buy Doug Thorley and they are good headers. He sold his business to Petronix but I believe he is still involved with the company.
Since then, Jardine performance bought Thorley and somehow obtained the full name again. Summit Industires (not Summit Racing ) own Jardine and Doug Thorley, still they are good headers.
As far as "tuned" headers, it really depends on how they are using the term. Generally Tuned are equal length long tube headers with the same length tubes for all pipes.
-
Ok, so Doug Headers, Thorley Headers, and Doug Thorley Headers, are technically all the same company and all good headers?
-
No, Thorley no longer exist it became Doug Thorley Headers, they are 2 different companies.
Dougs Headers are owned by Petronix
Doug Thorely Headers are owned by Summit Industries
-
what do u guys think bout purple hornies on a 305 with long tube headers? are purple hornies any good
-
From what I hear, purple hornies or any glass pack, for that matter, sound awesome initially, but deteriorate quickly and begin to sound like crap. From a performance standpoint, straight-through turbo style mufflers are better.
-
my buddy had a set of thrush glasspacks and he loved them, they lasted about a year and a half before they started to sound a little fuzzy...by the time 2 years rolled around he was replacing them.
-
^ Sounds-about right for glasspacks. I have Dynomax Ultra-flows on mine, which are a turbo-shape (oval case) flow-through design. I've always know turbo style mufflers to be the ones that redirect flow internally with the use of internal tubes and baffles (if you're lucky) so they aren't as direct as a flow-through mufflers. Why a turbo-style is called what it is, I'm not sure. Nothing 'turbo' about it I don't think lol What makes glasspacks different from something like the Ultra-flows are glasspacks use louvres that protrude a little into the exhaust stream to 'scoop' the airflow into them. This is more effective than the perforated tube inside the Ultra-flows for sound absorption, but are worse for air flow. That and cheaper glasspacks tend to bottleneck the pipe at the inlet and outlets. And them some glasspacks use two small internal tubes in parallel to route the air through them. This is also a restriction as it's less cross sectional area through the two small pipes vs. one larger pipe. If you want a 'classic' rap-rap-rap sounds, glasspacks are good for that. Through high school in the early 90's these trucks, pretty much bone stock but with 2" duals and glasspacks were the norm around the parking lot :)
-
I'm cheap. I have an incredible sound for under $200.
I did some lookin around and found an old set of unused longtubes for next to nothing. Did some more lookin and callin and found 2 sticks of 2.5" aluminized pipe for $35 out of an automotive repair shop that had overstock. I talked to several people to get opinions on what mufflers to run and I found that TWO WELDED THRUSH mufflers can be shipped to your door for around $65 and they sound deeper, a lil more quiet and with a smoother tone than the flowmasters that were on it. I got those for free by trading a tranny core that was given to me. I clamped on dumps instead of running the tailpipes that I had just because they were ugly as all get out. The collectors that I got were around $35 with the gaskets and it was less than $100 for all of the install parts, drinks, and food, with a very relaxed day in the garage.
If I wanted the tail pipes back on, I have enough pipe and hangers left over to do it. Thrush is better and much cheaper than Flowmaster IMHO.