Fabricate a Bell-Mouth Opening on a Stromung Downpipe? Whaddya Think? - Page 2
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This is a discussion on Fabricate a Bell-Mouth Opening on a Stromung Downpipe? Whaddya Think? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; russ, That's alot of clams for opening the mouth up. If the bellmouth design is important enough you might want ...

  1. #16
    Moderating on the run! Big Sky WRX's Avatar
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    russ,

    That's alot of clams for opening the mouth up. If the bellmouth design is important enough you might want to consider the ScoobySport, it's more expensive than the Stromung, but not $250 more expensive. Then again like you said you may have no problems at all.

    I'm also curious when you get your FP turbo back- this sounds like a good way to go for someone who wants a little more performance and values a quick spooling turbo.

    Big Sky

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  3. #17
    MisterX's Avatar
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    But I already have the Stromung. As I understand it the 2.5" is better for low end torque.

    Their customer service is not great. I called to discuss this with Stromung and never received a return call as promised.
    Last edited by MisterX; 07-23-2002 at 07:34 PM.

  4. #18
    Moderating on the run! Big Sky WRX's Avatar
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    ScoobySport is also a 2.5 " system (one of the reasons I've chosen their exhaust- the bell mouth design the other). You could always try and send it back- they may not be thrilled with that option however.

    When is your turbo due back? Did they give you any guesstimates on gains w/ it?

    Big Sky

  5. #19
    Registered User EIonJess's Avatar
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    Originally posted by bedabi
    Thanks for your input, everyone! Yeah, I think you're right. I'll go with Stromung after all.

    I'll be getting mine from Teague's Auto. http://home.att.net/~teaguesauto/index.htm

    The Stromung downpipe with cat is $259. A catless downpipe is $199.
    Do you know if either of the Stromung downpipes with or without cat will give you a CEL? I already have an up-pipe installed.

  6. #20
    Moderating on the run! Big Sky WRX's Avatar
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    With cat no cel, w/o cat cel. The 2nd O2 sensor is after the 2nd oe cat in downpipe, when that cat is removed (via catless dp) the O2 sensor reading causes a cel- cat inefficiency code. There are a couple of ways around the cel- one is electronic fix-fools the ecu into thinking everything is AOK w/ the 2nd cat. The other is to relocate the O2 sensor downstream of oe cat #3. The third option is to have a cat in the downpipe- Stromung, Graham Goode, others. The fourth option is godspeed's downpipe, no cels by using a top secret "micro" cat. In all of the reading I've done the cel P0420 will cause no harm, just headaches.

  7. #21
    Registered User EIonJess's Avatar
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    Originally posted by Big Sky WRX
    With cat no cel, w/o cat cel. The 2nd O2 sensor is after the 2nd oe cat in downpipe, when that cat is removed (via catless dp) the O2 sensor reading causes a cel- cat inefficiency code. There are a couple of ways around the cel- one is electronic fix-fools the ecu into thinking everything is AOK w/ the 2nd cat. The other is to relocate the O2 sensor downstream of oe cat #3. The third option is to have a cat in the downpipe- Stromung, Graham Goode, others. The fourth option is godspeed's downpipe, no cels by using a top secret "micro" cat. In all of the reading I've done the cel P0420 will cause no harm, just headaches.
    Thanx for the info, I am going with the Stromung downpipe with cat. I have enough headaches in my life.

  8. #22
    Registered User z3coupe's Avatar
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    GUYS!!!!!!!
    With the PDE cat-LESS Up/Down pipes, I get NO cel's at all - except recently. And that is because the EGT has gone bad - ONLY that. And Ian has told me that these are know to go bad a lot. Other than that - his exhaust works GREAT! So, as Stomung don't give a rats ass about talking to anyone - GET THE PDE pipes!!!!!!!!!!!
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  9. #23
    Registered User EIonJess's Avatar
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    Question Downpipe install

    Just wondering....how difficult is it to install a downpipe? Anything like installing an up-pipe? Anything in particular I should watch out for during the install??

  10. #24
    MisterX's Avatar
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    Downer is easy. I was told to watch out not to overtorque the bolts. I believe Vishnu might have the torque specs on his site.

  11. #25
    Registered User EIonJess's Avatar
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    Originally posted by russ
    Downer is easy. I was told to watch out not to overtorque the bolts. I believe Vishnu might have the torque specs on his site.
    Any idea what the performance difference is between a non cat downpipe as oppsed to a one with a hi-flow cat?

  12. #26
    Moderating on the run! Big Sky WRX's Avatar
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    Torque specs for down pipe (top and bottom) 35 ft lbs. some are putting in a new gasket (top), others aren't- I am- part #44022AA150.

    Depends on the cat that is in the down pipe- a race cat (lots of $) won't be a lot of difference. Your "basic" high flow probably giving up a few ponies to decatted one. Either will be a vast improvement over the oe, which is pretty restrictive.

    Big Sky

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