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  • Advice on exhaust setup for vortec 4.3

    I know the topic has probably already been breeched, but I'd figured being that I'm the F.N.G. I might be able to get away with asking.

    After much research I came across a steal of a deal on a set of Edelbrock headers (which were on closeout).....All the other header manufacturers from Advance Adapters, Hedman to JBA were way too pricey.

    So now I'm figuring out what's next from here....I'm not out to try to make the thing sound like a v8, I just want to improve my performance, whether it be a 2 into 1 setup or a true dual exhaust setup.... and whether I should go open exhaust or cats and mufflers....And lastly, if I go to a true dual exhaust should I go with an "X" pipe to equalize the flow...

    I appreciate everyones input. Just working towards getting the most out of the old girl

  • #2
    Re: Advice on exhaust setup for vortec 4.3

    What year is the truck? What kind of tone do you want and how loud do you want it?

    The collector opening is 2.5" which is pretty big for a dual exhaust for a stock motor. One option is to get an offroad y-pipe for one of the V8's, which i believe are made 2.5 into a single 3", which would be a fairly big size for the V6 but i don't think it will lose much velocity as the intakes on full size trucks is large enough to flow for a vortec 350.

    As for a muffler choice, i recommend a fairly small case Magnaflow (around 18" long should be good) and using something like a dynomax bullet or even a cherry bomb glasspack as a resonator. Or running a big case magnaflow (22 or 24") which should sound good if you are keeping the cats. This should help keep the raspiness out of the exhaust that can make the 4.3L's sound bad.

    But overall, i suggest you run to Youtube and search 4.3L and a muffler you are curious about and watch some vids and get an idea of what sounds like what you want.


    1983 Jimmy Sierra Classic-Future LSX Swap Recipient
    2002 Silverado 2500HD CCSB LT-Daily Driver
    1995 Corsica-Super-Sleeper in Progress

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    • #3
      Re: Advice on exhaust setup for vortec 4.3

      Thanks for the input.....

      It's a 1994

      Just listened to about 15 different youtube clips.... an Open Straight Pipe is out of the question, it sounds like garbage, as does the Cherry Bomb Glasspacks... I was impressed by the throaty sounds the Magnaflow Take 2's and 3's had.....

      Would it be too much a stretch to mock up a similiar system to what the new v6 camaros have..... I realize those are 304hp hi-perf v6's, but I think you could take the same concepts from that exhaust setup and mimic it a bit

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      • #4
        Re: Advice on exhaust setup for vortec 4.3

        I read a very interesting article on exhaust theory and design,but unfortunately didn't bookmark it for future reference.
        In that article the author stated that a crossover in order to have any benefit must be placed ahead of the cats.

        Actually I wouldn't waste your time with a true dual system.A single 3" system with a well built y pipe,high flow cat,and a straight through muffler would flow very well with minimal back pressure.
        3" pipe may be a little on the big side for a 4.3,but if you decide to cam it in the future then the engine will need the extra flow.My 2 cents...
        DD: 1989 Taurus SHO
        Project:1995 ECSB,Auto-5 speed manual conversion,Vortec 357,LT4 Hotcam

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        • #5
          Re: Advice on exhaust setup for vortec 4.3

          I would probably be inclined to go single 2.5" with a "Y" pipe, No CAT and a good muffler....

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          • #6
            Re: Advice on exhaust setup for vortec 4.3

            Sounds like a plan.
            DD: 1989 Taurus SHO
            Project:1995 ECSB,Auto-5 speed manual conversion,Vortec 357,LT4 Hotcam

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            • #7
              Re: Advice on exhaust setup for vortec 4.3

              I think so too....

              Just waiting on the headers.....think I'll give them a coating of hi-temp and a header wrap.... just went through this on my bike...now the truck....lol

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              • #8
                Re: Advice on exhaust setup for vortec 4.3

                i wouldnt wrap the headers just because the wrap would hold in moisture. getting the y pipe would help with flow as they used 2" pipes stock and press bent them. take a look at these and see if one would fit. http://www.jegs.com/p/JEGS/JEGS-Off-...58633/10002/-1 you could also spend $40 and be legal by getting a cat from here. i have had a flowmaster 40 on and i liked the sound it made but i could feel it restricting power above 3500 rpms. after a hanger broke i decided to redo it and went with a 3" pypes race pro dumped behind the axle. here is what it sounds like now

                https://dl.dropbox.com/u/2923633/edit%202.mp3
                Last edited by bobfig; 04-17-2011, 04:35 PM.
                05 Silverado 1500 CCSB - 799 heads milled .030", Airaid MIT, Black Bear Tune, and Magnaflow 12259, Tru-Cool 40k, Vette Servo
                97 c1500 RCSB 4.3L 3" Spintech Pro Street dumped, vette servo, and LS1 fans - SOLD

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                • #9
                  Re: Advice on exhaust setup for vortec 4.3

                  Are these Edie's TES system ? If so you'll get a nice y-pipe with the kit. They are
                  mid length. If you decide to run a cat, a Maggie flows really well. Then 3" pipe
                  all the way to the back with a Flowtech Afterburner will give a great sound without
                  the resonance. I have this on my lil truck with a 4.3 and some say it sounds pretty
                  decent for a old truck.

                  By the way, Edelbrock is having a close out on their TES systems. Not many left
                  but one CANNOT beat the price. Don't know if they have for any of the rides on
                  this forum, but here ya go..>

                  http://store.edelbrock.com/gmtruckandsuv.aspx

                  They are also having closeouts on a lot of other parts as well.
                  Last edited by no2guncntrl; 04-17-2011, 06:54 PM.

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                  • #10
                    Re: Advice on exhaust setup for vortec 4.3

                    Thanks Bob.....i'll check out the flowmasters.....sounds really good

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                    • #11
                      Re: Advice on exhaust setup for vortec 4.3

                      That is what I picked up.... the "TES Tubular Exhaust system Lowered Chev & GMC Pickup, Suburban 1500 Series 93-94 2wd. Auto trans.only 4.3L V6, TBI"...... couldn't beat it for $114.xx

                      Especially, since I've seen some going for as much as $600/pair

                      So, I'll forgo the header wrap and just go with the high temp ceramic rattle can coating....just for a little oxidation protection and improved heat transfer......I was thinking of turning the exhaust pipe down right ahead of the rear passenger wheel.....i don't know whether i'll bother with a cat. conv....just run it from the y-pipe back to a nice muffler and turn it out from there

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                      • #12
                        Re: Advice on exhaust setup for vortec 4.3

                        I'd throw a cheap glasspack muffler on it in place of the cat though, these engines can get pretty raspy and the glasspack just takes the nasty edge out of the tone.


                        1983 Jimmy Sierra Classic-Future LSX Swap Recipient
                        2002 Silverado 2500HD CCSB LT-Daily Driver
                        1995 Corsica-Super-Sleeper in Progress

                        Comment


                        • #13
                          Re: Advice on exhaust setup for vortec 4.3

                          Originally posted by Koots View Post
                          I'd throw a cheap glasspack muffler on it in place of the cat though, these engines can get pretty raspy and the glasspack just takes the nasty edge out of the tone.
                          Makes sense.....I could see where that'd take the harshness out of the sound....specially since the exhaust pipe is going to be somewhat truncated

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                          • #14
                            Re: Advice on exhaust setup for vortec 4.3

                            Oh boy....fun fun fun!

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                            • #15
                              Re: Advice on exhaust setup for vortec 4.3

                              man those are tempting to buy..... i have an 06 4.3......

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