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High Flow Cats? Magnaflow vs Thunderbolt vs..??

This is a discussion on High Flow Cats? Magnaflow vs Thunderbolt vs..?? within the External Engine forums, part of the LSx Technical Help Section category; So I ordered LTs and a Y pipe and I need cats to be installed in there somewhere. Not for ...

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    High Flow Cats? Magnaflow vs Thunderbolt vs..??

    So I ordered LTs and a Y pipe and I need cats to be installed in there somewhere. Not for emissions but for noise reduction really but passing emissions is obviously a little peace of mind from the local piglets.

    Anyone have experience with magnaflows? thunder bolts? other brands? thunderbolts are $30 ish on ebay, the mags $65 ish.

  2. #2
    Quote Originally Posted by 5abivt View Post
    So I ordered LTs and a Y pipe and I need cats to be installed in there somewhere. Not for emissions but for noise reduction really but passing emissions is obviously a little peace of mind from the local piglets.

    Anyone have experience with magnaflows? thunder bolts? other brands? thunderbolts are $30 ish on ebay, the mags $65 ish.
    I have magnaflow catback with high flow thunder bolt cats. Sounds amazing. Quite at idle, but it screams at wot.

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    Do you have th. Bullet 3" ones ? Still pass emissions?

  4. #4
    Quote Originally Posted by 5abivt View Post
    Do you have th. Bullet 3" ones ? Still pass emissions?
    Not sure. I brought the car to my buddy at his shop and he said he had thunderbolt high flow cats in stock of a 98-99 ls1. Then he put them on. Didnt notice any difference in sound or performance. He said you would be luck to get a 3 hp gain with high flow cats.

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    igofast Brandon35thSS's Avatar
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    red with 35th le stripes
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    thunderbolt cats added to a tsp ory,pacesetter longtubes,lm1 = no rasp and very little drone.

    [ame]http://www.youtube.com/watch?v=jDYDXfTPwJs&feature=player_embedded[/ame]

  6. #6
    Quote Originally Posted by Brandon35thSS View Post
    thunderbolt cats added to a tsp ory,pacesetter longtubes,lm1 = no rasp and very little drone.

    Sounds great.


    ps im sure the cops love that plate

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