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Dual exhaust

Old 11-22-2018, 12:02 PM
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I have 1994 f150 5.0 engine, whats the best size excaust for low in power. 2inch,2.25 3 inch ?
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Old 11-22-2018, 01:58 PM
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Factory is the best size. What exactly is wrong with the current exhaust system?
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Old 11-22-2018, 06:44 PM
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Want little more power and sound
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Old 11-22-2018, 10:58 PM
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So the answer to my question is "nothing"?

How little more power do you want? Buy a slightly more-powerful engine. For sound, buy a stereo.

If you want the engine in THIS truck to be reliable & cheap to maintain, maintain it - don't try to re-engineer it, and don't tear up or replace things that are working correctly.
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Old 11-23-2018, 12:55 PM
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Magnaflow and a few other manufacturers make kits that are post cat, all kinds of configurations. Most come in the standard 2 1/4 diameter.
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Old 12-02-2018, 07:48 PM
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A fairly stock 302 you could do 2 1/4" true duals with an H pipe, maybe a pair shorty headers long tubes are better, are you in a place where they smog check?
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Old 12-02-2018, 09:44 PM
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Originally Posted by MPP8405 View Post
A fairly stock 302 you could do 2 1/4" true duals with an H pipe, maybe a pair shorty headers long tubes are better, are you in a place where they smog check?
no dont have to worry about smog check.
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Old 12-02-2018, 10:10 PM
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If thats the case i'd remove the cats as well. might want to remove your smog pump if you haven't already,and the air tube leading to the cat, you might get a check engine light doing that but as long as you know the codes are for the emissions you could just drive it like that.
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Old 12-03-2018, 06:11 AM
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Originally Posted by MPP8405 View Post
If thats the case i'd remove the cats as well. might want to remove your smog pump if you haven't already,and the air tube leading to the cat, you might get a check engine light doing that but as long as you know the codes are for the emissions you could just drive it like that.
Just plug off the yellow and pink plastic vacuum lines at the solenoids located on top of the intake manifold located just to the left below the brake master cylinder. That should keep the CEL from coming on...
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Old 12-03-2018, 06:35 AM
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Originally Posted by Sam McIntosh View Post
I have 1994 f150 5.0 engine, whats the best size excaust for low in power. 2inch,2.25 3 inch ?
After I finished my 351 swap, I cobbled up and Frankensteined the exhaust using my six cylinder cat behind the Y pipe and used it as a muffler just so I can drive it to a muffler shop. The first shop wanted $700 to do duals with Flowmasters while a second shop was going to charge me $1500 because he was going to put a new cat as well as Flowmasters. I didnít like either of those prices so I cleaned up my Frankensteined exhaust job, got clamps, hangers, 2.5 inch pipes(two) and 2.5 inch 90 degree elbows(two) and a short Flowmaster knock off with dual outlets and had the 2.5 inch elbows and pipes come out the side in front of the rear wheel. Itís actually not too loud or obnoxious if I short shift it....
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