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Difference between single, double can exhaust and tubi?

Discussion in '308/328' started by PassionIsFerrari, Jul 17, 2005.

  1. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    1.) What is the difference between the single can european exhaust, the double can exhaust, and the tubi?

    2.) Does the single can european function like the tubi?

    3.)What are the weights of all three?

    4.) Does the tubi and single can keep your engine cooler, then the double can...what about between the tubi and single can?

    5.) If a tubi is out of price range, would a change from double can to single can exhaust be effective? Why or why not and it what ways...

    Thanks guys, I just hate the heat that the double can exhausts create... Trying to find a solution...
     
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  3. No Doubt

    No Doubt Six Time F1 World Champ
    Consultant

    May 21, 2005
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    Mr. Sideways
    This is *not* my opinion, but here's what the Lotus guys are saying about Tubi:

    http://www.hsv.org.uk/topic.asp?f=17&h=28&t=153608

     
  4. carguy

    carguy F1 Rookie

    Oct 30, 2002
    3,317
    Alabama (was Mich.)
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    Jeff
    Interesting questions. I have a "4 can" exhaust on my TR....a Borla system. It is very light weight compared to stock, and runs so cool that I removed the stock ugly heat sheild. The system bolts directly to each of the 4 headers, with 4 straight-thru mufflers, and 4 tail pipes. It's surprisingly mellow in tone. But at full throttle it howls quite nicely yes indeedy!!
     
  5. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Heat isn't being created by the muffler -- it's in the cat. I'm no chemistry dude, but here goes: When unburnt hydrocarbons get slammed into platinum or palladium, it basically gets the leftover carbon monoxide and hydrocarbons to burn up. Voila! Heat! The better CFM of the cat (like HyperFlow), the faster those burnt up gasses get tossed out the back of the car.

    In the muffler, there is no catalyst, so it's just the existing hot fumes that flow through it, muffling the noise. I suppose the more restrive the muffler, the longer those hot gasses would stay in there. Longer time in the muffler = more backpressure = less heat released.

    techs... did I get this all wrong?


    .

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  6. plugzit

    plugzit F1 Veteran
    Rossa Subscribed

    Dec 1, 2004
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    Redondo Beach, CA
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    Bruce Bogart
    If I may hitchhike on your thought....
    How about a single can off a 355 put on a 348. It has a bypass system-some kinda vacuum operated valve-that bypasses the cats-and maybe a chamber or two in the muffler? That's what that inlet in the top center of the 355 muffs is. It's a single can, and definitely lighter than the doubles on 348s. I can lift the single, but probably not both doubles at once, so it's a few pounds lighter. The cutout pipe if fed by a pipe beginning at a split in the exhaust manifold. So, a cat modified with another pipe beginning about where the oxy sensor is-feeding the cutout (sounds so 50s) would surely produce good sounds, lower backpressure, and more horsepower.
    Total cost? 355 muffler on ebay about $200
    Cat modification at local muffler shop $200?
    Cutout valve off 355 from junkyard ?
    Vacuum hose $1

    Ferrari has used exhaust modification to get extra horsepower for years.
    I'll call it Frankenferrari!
     
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  8. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    Does bolt right up otherwise? What about welding shut the top inlet and going from there...Would that be comparable to a 'cheap' tubi....

    355 exhaust sales would go through the roof at $200 for an 'almost' tubi
     
  9. carguy

    carguy F1 Rookie

    Oct 30, 2002
    3,317
    Alabama (was Mich.)
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    Jeff
    I just happen to have a 355 muffler laying around if you want to try it out. And I will honor your "quoted ebay price of $200" plus shipping costs.
     
  10. No Doubt

    No Doubt Six Time F1 World Champ
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    May 21, 2005
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    Mr. Sideways
    Would you need two cutout valves with that concept...and no new cats or track pipes?
     
  11. plugzit

    plugzit F1 Veteran
    Rossa Subscribed

    Dec 1, 2004
    7,337
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    Looks like you could bolt a plate over it with a gasket if you didn't want to use it. I think the cats would have to be modified slightly-cheap job at the muffler shop-to hook up to the new inlets on the 355 muff. I think 355 stuff would have to be modified as well, since the header pipe is split to accomodate the bypass pipe and the cat, so I would see no advantage to buying 355 cats or track pipes.
    It definitely bolts up to the springmounted muffler hangers on the 348.
    There's only 1 of the bypass valves on a 355, bolted to the single inlet at the top center of the muffler, so without looking I'm guessing that the bypass pipe on the 355 is a y-pipe.
     
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