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HT4100 4.1, 4.5, 4.9 Discussion, 7mpg average! Help if anyone can. in Cadillac Engine Discussion; would a flomaster highflow cat help? and should i replace the rest of the exhaust while im at it?...
  1. #16
    quins90lac's Avatar
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    Re: 7mpg average! Help if anyone can.

    would a flomaster highflow cat help? and should i replace the rest of the exhaust while im at it?


  2. #17
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    Re: 7mpg average! Help if anyone can.

    Quote Originally Posted by quins90lac View Post
    would a flomaster highflow cat help? and should i replace the rest of the exhaust while im at it?
    http://www.magnaflow.com/02catalytic...irectfit=23223

  3. #18
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    Re: 7mpg average! Help if anyone can.

    this is a better deal just have to have a welder. http://shop.advanceautoparts.com/web...S_867077544___

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  5. #19
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    Re: 7mpg average! Help if anyone can.

    That's the universal one though not the direct fit made for your car.

  6. #20
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 7mpg average! Help if anyone can.

    Quote Originally Posted by Forgoten214 View Post
    That's the universal one though not the direct fit made for your car.
    I just reamed mine out and put it back up, that's about as high flow as you can get

    Opens the sound of the exhaust right up....

  7. #21
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    Re: 7mpg average! Help if anyone can.

    Really? Do you happen to have a sound clip?

    I've wanted to hear what a 4.5 or 4.9 sounds like with a aftermarket setup. I bet it sounds awesome.

  8. #22
    quins90lac's Avatar
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    Re: 7mpg average! Help if anyone can.

    thought about stuffing mine with heavy duty steal-wool. and right now its got a cherybomb turbo muffler should sound nice.

  9. #23
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    Re: 7mpg average! Help if anyone can.

    Quote Originally Posted by Forgoten214 View Post
    Really? Do you happen to have a sound clip?

    I've wanted to hear what a 4.5 or 4.9 sounds like with a aftermarket setup. I bet it sounds awesome.


    Flowmaster 80 series, no cat. Its fun for a while but the droning gets old quick.

  10. #24
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    Re: 7mpg average! Help if anyone can.

    Quote Originally Posted by Sevillian273 View Post


    Flowmaster 80 series, no cat. Its fun for a while but the droning gets old quick.
    Hmm doesn't sound too loud. You get alot of droning?

    I heard Magnaflow isn't as bad from inside the cabin.

  11. #25
    the recluse is offline Cadillac Owners Connoisseur
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    Re: 7mpg average! Help if anyone can.

    Quote Originally Posted by Forgoten214 View Post
    Really? Do you happen to have a sound clip?

    I've wanted to hear what a 4.5 or 4.9 sounds like with a aftermarket setup. I bet it sounds awesome.
    I took my stock cat down and opened it up, then stuck it back up. That alone open up the sound of the exhaust, but not to the point where I don't like it.

  12. #26
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    Re: 7mpg average! Help if anyone can.

    Quote Originally Posted by Forgoten214 View Post
    Hmm doesn't sound too loud. You get alot of droning?

    I heard Magnaflow isn't as bad from inside the cabin.
    The droning is nothing compared to a glasspack but its there. IMO the sound with the Flowmaster and no cat is just too abrasive for everyday driving. It def had a great idle sound though. It drew alot of attention.

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