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Tractor Talk Discussion Forum

2 or four inch pipes?

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Tim Shultz

03-30-2006 07:44:33




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I have my hedders on now.. going to take the pick up to town this week or mabey next to get the pipes put on. but should I go with a four inch pipe or 2 inch? I was told by one guy to go with 6. but was thinking 4 was the way to go. and how good are glass pack nowdays? my dad said he had some on a 67" nova. but wasn"t sure if they was legal now? and what about a cat. converter? truck didn"t have one when I got it. but being a 73" I don"t have to have one right? not sure.. I googled till I was blue in the face.. so if anybody could help me out it would be great! Tim Shultz

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Steve Crum

03-30-2006 21:29:26




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
I've built all kinds of systems for all kinds of engines and build what the customer requires. The customers that listen to me are usually the most satisfied. 2 1/2" duals are more than enough for even a 500 ci Cadillac engine. cross over the 2 1/2" diameter (2 3/8"id) threshhold and unless you have a 6-71 Detroit blower on it you've screwed your flow velocity and inturn your volumetric efficency, read this as a major loss of horsepower and torque. Flowmaster mufflers are nice if your into paying twice as much for a trademark with no appreciable improvement in quality, Flotec's are my choice if I don't build my own and if I use cats they are the Magnaflow stainless jobs, (EPA approved). Cats then mufflers and then the straightest possable shot out the back

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Mark - IN.

03-31-2006 08:38:35




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 Re: 2 or four inch pipes? in reply to Steve Crum, 03-30-2006 21:29:26  
Steve, best advice I've seen here. He didn't mention cubes, so 2.5" are probably a good bet. Duals w/a crossover is always a great bet. The headers though? Often cause more HP loss than net because are usually within a RPM range that most don't use on the street. Most buy them because... they look or sound good, but never consider matching them up with the rest of the components. And besides, most headers become scrap after only a couple of years because are never properly treated by their new owner coming out of the box. Glass packs have always been junk. The internals are like razer blades cutting into and restricting the exhaust. And they too become junk soon, if they're still made. Personally, I'd scrap the headers and find a good set of unrestricted pre-smogger manifolds and run the exhaust as you mentioned, if could get away without smogger pumps and stuff for a daily driver. Catyletic converter? 1/2 ton? 3/4 ton or above? He didn't say, and left out the counterpart variables to tune the engine, so your advice is the safest bet.

Mark

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Steve Crum

03-31-2006 08:58:57




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 Re: 2 or four inch pipes? in reply to Mark - IN., 03-31-2006 08:38:35  
I failed to mention that I don't recommend headers for a street application anyway, just too many driveability and maintenance issues for what you get in improved performance in the idle to 3000 RPM range. Of course the engine must be cammed and tuned to realize any advantage. IMHO H pipes cause too much turbulence in the system. If I use something like this, I fabricate an X pipe for better scavenging.

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Don L C

03-30-2006 20:50:53




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
6" tailpipes ....sounds like you are hanging out with 12 old kids.....Gas engine 454/ 460, will run its best with 2 1/4 or 2 1/2" Pipes....Be careful with the mufflers ....they can be 2 1/2" in and out, but smaller inside.....J C Whiiney used to sell 2 1/2" straight through.....this will make you a nice setup..... ..



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Coloken

03-30-2006 11:12:05




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 FWIW in reply to Tim Shultz, 03-30-2006 07:44:33  
When I bought a Chev. in 75...over 6000 GVW did not require smog stuff and below 6000 GVW did require smog and cat converter. My 4 wheel 1/2 ton was just over the 6000 and did not have any smog junk.



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Can't even use my name

03-30-2006 09:31:50




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
Haa haa! 6 inch pipes on a gasser! No way no how would you need 4 inchers let alone 6. Most diesels in the pickups will run just fine with 4 inch and they move a lot more air. I have a true dual exhaust on my '95 Chevy truck. From the headers there are two high flow cat's two high flow mufflers and two pipes out the side behind the wheels with two chrome tips. The pipes are 2 1/2" and the tips are 3". I have heard they perform and sound better with an H pipe installed but mine sounds just fine. Not too loud while cruising but hit it and she bellers. Only problem I ran into are the felt header and collector gaskets, shitched to copper and are fine now.

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dairyman

03-30-2006 08:25:01




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
that truck did not have a cat. converter on it from the factory. I have a 78 chevy with 40,000 orginal miles and still has the orginal exaust system on in and there is no cat. present.



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Nebraska Cowman

03-30-2006 08:05:18




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
I ran 2 inch pipes from the cats back on my 04 Dodge Hemi. It does sound sweet and no, we didn't put any mufflers on it. To me the larger pipes sound "hollow" I like to hear a truck cackle.



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Badly Bent

03-30-2006 07:59:10




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
I have the long-tube headers, 2 inch pipes, glass pack mufflers and dual exhaust clean out the back of my '74 Ford. It runs like a demon, but too loud for my taste. I would recommend putting either Flowmasters or or some other muffler that will actually make the engine quieter with a more "tuned", mellow sound. Unless you plan on running the engine at extreme RPM's the 4 inch pipes are just not necessary. Tim

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RustyFarmall

03-30-2006 07:58:47




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 Re: 2 or four inch pipes? in reply to Tim Shultz, 03-30-2006 07:44:33  
If your truck did not have a catalytic convertor to begin with, it does not need one now. Glass pack mufflers are acceptable in my part of the country, don"t know about your"s. Your biggest problem with noise will be local city ordinances. You are totally dreaming when you speak of 4 inch or 6 inch diameter pipes. First, you probably won"t find a muffler shop that even has anything of that size, and second, that large size pipe will be a very difficult, if not impossible fit underneath the truck. 2 1/2 inch diameter pipe will be more than adequate, and 2 inch would work just fine also. Unless you just plain want noise, go with something other than glass packs. There are mufflers that will perform better with less noise.

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Badly Bent

03-30-2006 08:01:59




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 Re: 2 or four inch pipes? in reply to RustyFarmall, 03-30-2006 07:58:47  
Rusty, I see that you and I think alike in most respects. Come to think of it I believe my pipes on my truck are 2 1/2". Whatever the standard pipe dimensions are. Tim



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