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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford TruckSPONSORED BY:




 
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Old 08-03-2011, 10:21 PM
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Single or Dual Exhaust

1984 302 2bbl. F150 XLT
Headed to the muffler shop Saturday need ideas.
I have the factory set up with 1-cat and long round muffler exits on the passenger side rear of the bed.
All the pipe has holes in it so need to start over. I am in Texas so the cat can go since it's over 25yrs old now.
Not wanting to spend too much. Thoughts are 2-1/2 or 3" single exhaust run all new from the exh manifolds and a single turbo muffler keeping the factory set up at the rear. Kind of like the idea of keeping the stock look. Looking for more of a performance and MPG improvement than sound.
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Old 08-03-2011, 10:32 PM
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IMHO 2.5" might even be too big for a 302 but it's been a while since I've been in this area and forget for sure.

There were some knowledgeable people in the Exhaust Forum when I was doing this a few years ago, might check there and/or look in the archives there.
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Old 08-03-2011, 11:48 PM
Shark Racer Shark Racer is offline
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A single 2.5" should be great for a 302. I wouldn't go for more unless the motor was really hopped up.
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Old 08-04-2011, 01:51 AM
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I have a single 2.5 going into a Flowmaster 50 series and 2.75 as a tailpipe from the muffler. Huge improvement over my dual 2.5 that I had before. Way more bottom end! It is a bit loud though and I won't pick the Flowmaster next time around.
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Old 08-04-2011, 02:03 AM
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I have stock manifolds and 2" peashooter--I mean, exhaust pipe--running to a 2.5" 40 Series Flowmaster right under the bed. Wasn't too loud with the stock tailpipe connected, but once I got it cut off right at the muffler outlet...I wake up the whole neighborhood now.

...at 3:20am

http://www.youtube.com/watch?v=6TlOOKkjAsk

I might be interested in that old muffler if it's an OEM unit. I have an idea involving a Flowmaster, an OEM muffler like what came on our trucks, and a cable-actuated exhaust cutout...sleeper mode
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Old 08-04-2011, 04:33 AM
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Quote:
Originally Posted by ctubutis View Post
IMHO 2.5" might even be too big for a 302
I agree with this in a lower-rpm/higher torque application (truck).
Different with a high rpm race motor.

A good extraction effect needs good exhaust velocity (without backpressure), & if the pipe dia. is too big for the rpm being run, this is lost.
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Old 08-04-2011, 05:01 AM
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Just my opinion, but anything over 2.5 inches on a 302 just sounds groggy, especially on a low rpm truck... i would (and have) run a 2.25 inch H pipe with glasspacks. it helps your gas mileage, and it has the perfect balance between loud and quiet... its quiet at stop signs, at idle, and when you get on it it actually sounds good. not groggy and not to much rap either. Its usually a pretty cheap set up to ( I took the pancake Cat off of the trans-am and that payed for my hole exhaust on my 250 excluding the headers i bought later.) i run it on my 88 bronco II with my 302 and its awesome! i also have a 2.5" H pipe glasspack setup on my 83 F250 with a 460, but the sound is starting to go downhill because of the holes that are forming in the exaust... sorry for the long post!
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Old 08-04-2011, 03:48 PM
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Bear in mind the OP is talking about SINGLE exhaust, not dual. A single 2.5 is not much exhaust volume at all, and is still very much bottle necked by the manifolds.
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Old 08-04-2011, 05:55 PM
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@Galm_3 WaxenSole0464
Hey firebug, do you happen to have any videos of that 460?

Mine has headers and magnaflows on it right now but just wondering how that sounds.
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Old 08-04-2011, 06:02 PM
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Not right off hand, but ill see if I can't make one for ya when I take it for a spin one of these days
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Old 08-04-2011, 07:12 PM
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Quote:
Originally Posted by 99Mountain View Post
1984 302 2bbl. F150 XLT
Headed to the muffler shop Saturday need ideas.
I have the factory set up with 1-cat and long round muffler exits on the passenger side rear of the bed.
All the pipe has holes in it so need to start over. I am in Texas so the cat can go since it's over 25yrs old now.
Not wanting to spend too much. Thoughts are 2-1/2 or 3" single exhaust run all new from the exh manifolds and a single turbo muffler keeping the factory set up at the rear. Kind of like the idea of keeping the stock look. Looking for more of a performance and MPG improvement than sound.
Have you talked to the muffler shop about this yet? If they cut the cat off, good for you, but that's not a Texas law thing, the cat would fall under a federal law. Don't be surprised if they refuse to get rid of it.
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Old 08-04-2011, 08:31 PM
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I also think you should look into the cat requierment. Dont think over 25 years means you can remove it. Only means you ar excempt from emissions test required in some areas.
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Old 08-04-2011, 09:20 PM
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Err, my truck has no cats

Luckly, the state of Indiana is so lax on emissions that I don't think it should ever be a problem, plus, mine is 26 years-old
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Old 08-05-2011, 11:02 AM
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Quote:
Originally Posted by Galm_2 View Post
Err, my truck has no cats

Luckly, the state of Indiana is so lax on emissions that I don't think it should ever be a problem, plus, mine is 26 years-old
That's ok, and no one officially will ever know. But what I am saying is if you take it to a place of business like a muffler shop, and tell them to cut the cat off, they may not do it. They work on newer vehicles, and they can't cut them off, and if they replace them, they have to have paperwork to go along with it, and they can't sell the old cats. So if you roll in there with your "old" truck, you may be intangled in all that mess and they won't cut them off.

If you cut them off yourself, and it's never inspected, then that's a different story. And you can always find a back alley shop sometimes, or the person who owns the shop is someone you know personally, and they will cut them off for you.
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Old 08-11-2011, 01:13 AM
firebug_thekid firebug_thekid is offline
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Quote:
Originally Posted by Galm_2 View Post
Hey firebug, do you happen to have any videos of that 460?

Mine has headers and magnaflows on it right now but just wondering how that sounds.
My dad just ripped the pan off my truck today (technicly yesterday). seems he had a little mishap with a tree stump. nothin says happy birthday like goin to pick ur truck up on a trailer at 6 in the afternoon sorry ur gonna have to wait a week or two for that vid.... i found an old one with the single glasspack and pipe tho if ur interested.
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Old 08-11-2011, 01:13 AM
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