Custom exhaust any interest?

Mopar Exhaust Systems

  1. Mean416

    Mean416 Well-Known Member

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    Also makes it pretty easy to adapt from one header to another. Just change the design of the collector extension.
     
  2. ScamperTom

    ScamperTom Supposed to be working

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    That seems like the best way to actually market this. If you built a standard exhaust in two sizes, and then three or 4 collector extensions that fit the most produced header designs, it seems like it would fit a lot of cars. Not sure how else you’d make a true bolt in exhaust. In my experience, off the shelf exhausts nearly always need modification to fit right. I guess every car is different.
     
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    • roccodart440

      roccodart440 Well-Known Member

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      I like the idea of creating a new product that doesn't exist.

      I'd like to see a 3.5" exhaust

      A 3.5 to H or X pipe to 3"

      An exhaust for mini tubbed cars

      A stainless system

      a system with electric cutouts
       
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      • Mean416

        Mean416 Well-Known Member

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        Good ideas...

        Would mini tubbed system fit non mini tubbed cars also I wonder?

        I think the big thing wiia lot of this will be sticker shock. Stainless is expensive, so are cutouts.

        If I did a cutout it would be configured differently from all the cutouts I've seen. The straight through path would be the cutout opening and the muffler side would split to the side.
         
      • roccodart440

        roccodart440 Well-Known Member

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        There are 3 options for mini tub cars:

        -Side exit, such as a T/A -- AAR style
        - Stock exhaust route with straight tail sections (requires a fuel cell narrower than the stock tank drop mounted OR fuel cell in trunk)
        - tail pipes where the exhaust snakes through the rear section of the leaf spring. This requires a car that uses 2.5" pipes OR sits a touch high

        I just bought a polished stainless system for my dads el camino. If they can make stainless systems for chevy cars that aren't crazy priced they can make them for ours.
         
      • Mean416

        Mean416 Well-Known Member

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        Those options seem not so great to me. If I had access to a decent mini tubbed car I might be able to figure something out. Anyhow you'd need a pretty serious car to really need 3.5" tailpipes right?

        The name of the manufacturing game is volumes. My price will be directly correlated to how many I run at a time. I imagine the Chevy platform would be a lot more common.

        The suggestions about the cutout does have me thinking though...
         
      • mopowers

        mopowers Well-Known Member

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        How about long tube headers for a big block early A body???
         
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        • Mean416

          Mean416 Well-Known Member

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          I would love to painstakingly develop a superior product and then have customers curse the day I was born due to whatever random fitment issue they have. I basically enjoy self destruction so sure why not? :D
           
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          • roccodart440

            roccodart440 Well-Known Member

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            Tell me why you'd step the exhaust down from the collector diameter other than space/clearance.
             
          • Mean416

            Mean416 Well-Known Member

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            This is totally open for debate and I don't claim to be the expert here. I would like to actually dyno this to see what happens. But the reasoning is thus.

            1. Our V8 engines at WOT, in the lower rpm ranges, (say 3000-6000) seem to make a lot more torque with collector extensions than without. The only testing I've been able to find on this is with open exhaust.
            2. Using collector extensions is a wave/scavenging effect, not a flow rate thing.
            3. The wave tuning will happen when there are significant/abrupt changes in diameter
            4. Since it's a wave tuning property it stands to reason that it MIGHT also hold true even with an exhaust system connected
            5. (Unrelated to power but very important for cost control) Having a collector extension connection allows easy hookup to different header collector diameters and locations.
             
          • roccodart440

            roccodart440 Well-Known Member

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            Collector extensions do make more power (if they are the correct length) but they are typically the same diameter of the existing collector or a 1/2 inch step. So again, if you kept the whole system the size of the collector, in a perfect world, that would be better than a step down or multiple step downs. I.e. 3.5" collectors to a 2.5" system.
             
          • Mean416

            Mean416 Well-Known Member

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            I guess I'll just have to test it out. I generally agree a full length 3.5" system would be freer flowing, but dual 3.5" is way more than I need. You really have to be putting down some serious power levels to even need dual 3". That's 4 digit power territory there. This is why I'm sticking with 2.5. my combo as is will do very good to go north of 475 at the crank.
             
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            • Ironracer

              Ironracer Gearhead

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              Could he take a framing square and a degree tool ( speed square) and give you dimensions/ angles of °?
               
            • Mean416

              Mean416 Well-Known Member

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              He could but my main limitations are bend radius for a given tube diameter and minimum distance between bends. So I just have to make this as compact as possible with the given tooling limits.
               
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              • roccodart440

                roccodart440 Well-Known Member

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                At 500hp+ you'll see a loss going to 3" dual from larger. Dyno proven.

                If your header collectors are bigger than your exhaust system, by your logic, the headers are too big for the engine, which isn't the case necessarily.
                 
              • 33IMP

                33IMP Well-Known Member

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                I am currently running a 3 1/2 system to the back bumper. Pieced together with straight pipe and mandrel bends. Huge mufflers! It's probably too big for this 500hp 440... but it was built for the next combo, 522" nitrous motor.
                But heck, I ran a 3 1/2 system on a small block too.
                 
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