Performance exhaust is hard to find!

Discussion in 'Engine & Performance' started by Nabby, Aug 1, 2013.

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  1. Nabby

    Nabby Junior Member

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    Hi, new here! I recently picked up a 91 D-150 that I'm slowly gathering parts for, trying to beef it up a little... the exhaust leaks like mad, so I'm thinking I might just redo the whole thing, I don't have a lot of bills, so I have a pretty regular flow of disposable cash. I live in Nebraska, so there's no emissions testing that I know of, but I've heard once or twice of friends having a cop look under their car for a cat and write them a ticket, although my ex-wife's father drove without a cat on his Blazer for years. I'd like to play it closer to legal and keep a cat (or two) on there, even though I'm eyeballing Hooker long tube headers.

    Does anyone know where I can find a 2.25" X pipe for the 1st Gen? The headers I really like have a 2.5" collector, with a recommended 3-bolt 2.5" to 2.25" reducer. I'll weld the reducers to a 2.25" inlet and outlet universal cat on each side, then hopefully find an X pipe to attach to those. That should allow me to beef up the engine to the high 300's HP when I get to that and still allow it to breathe. The only thing I'm going to miss is having a hot air tube from my exhaust up to my air cleaner. It gets cold here in the winters.

    As far as going to dual exhaust, I assume that means doing away with the TBI, since it only takes one O2 sensor? And if I switch to a carb, how does that link up to the (what I think is an a518/46RH) transmission?

    So, yeah... any advice, please share! I've been trying my hardest to find a good forum with active members, and so far this one looks great!
     
  2. PCA4208

    PCA4208 Senior Member

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    Stick with the TBI as converting takes a while. Mainly just ripping out all the sensors and high pressure fuel pumps. You can still have a 02sensor, just have your exhaust shop weld in a bung before the cat.
     
  3. Nabby

    Nabby Junior Member

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    The reducers have bungs for O2 sensors, just wasn't sure what to do with needing a separate sensor for each side, but the computer is designed for only one sensor. Do they make any kind of kit that can take a sensor from each side, average them and then relay the result back to the computer? I don't want to leave one bank completely ignored. Also, there's no exhaust shop involved. I have every manner of torch and pipe benders at work, so putting it in won't be all that difficult once I have the parts.

    I may end up with either this http://www.etrailer.com/Accessories...tml?feed=npn&gclid=CIXm0pjX3LgCFRRk7Aod0igA9A or possibly this http://www.magnaflow.com/02product/displayapplications.asp?partnumber=14385 although I'm leaning toward just the X pipe so I can have more of a selection of mufflers because I don't want to get it too loud, my buddy recently got his Trans Am checked by a cop for sound levels when a neighbor complained. I'd like to avoid that.
     
  4. PCA4208

    PCA4208 Senior Member

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    I dont know if there is anything like that 02 sensor idea. Putting a carb on isn't hard, but the TBI manifold won't accept a regular 2 barrel. I think someone makes an adapter for it, or you can just get a 4 barrel carb and manifold.
    As for the exhaust, if you can get an x pipe to fit under the truck, go ahead. If you don't want too loud of a sound, but still want the sound, I'd advise some magna flow 18" mufflers. they sound great, but aren't loud when you don't want them to be.
     
  5. Chewy

    Chewy Senior Member

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    Keep the exhaust at a sane volume level and cops won't bother looking under the truck. Make it annoying and watch out!

    I for one won't run without a cat. The new high flow cats produce little back pressure.
     
  6. Casper

    Casper U.S. Navy (Ret.) Military

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    ^^good advice.
     
  7. Nabby

    Nabby Junior Member

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    Hmmm... I don't really want to switch to a carb on this engine. I figure with 318's being a dime a dozen (saw one on craigslist needing rebuilt for $75 a couple days ago, one already built and pushing 300hp for $600 yesterday)... so I was thinking of building an engine in my garage while I drive the truck and then just swapping it in.
    I know a little about electronics and O2 sensors are pretty simple. I'll see if I can't work out something to just use two.
     
  8. PCA4208

    PCA4208 Senior Member

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    I'd say do the build on the engine. Even if you can find a good 360 builder. With a simple port match, bowl blend, cam, and 4 barrel. They can easily get 350-400 hp and tq.
     
  9. 88rambigblock

    88rambigblock Senior Member

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    I had 435hp and 410 ft lbs out of an old 318 before I switched over to big block. switching over to carbed is much harder and in depth than I realized. that said it was worth all the extra time and money!
     
  10. crazzywolfie

    crazzywolfie Senior Member

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    what type of modification did you do to get that much power out of a 318 because i know of someone who has a turbo 318 and he is only putting out about 300hp.
     

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