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  • Is the Cat worth keeping?

    I just got a Flowmaster 80 series exhaust installed about a month ago and I was thinking about cutting the Cat off. I asked around and all my friends said to cut it off to gain power. I was wondering how it would sound with it cut off with my Flowmaster 80 series muffler.Do any of you have this setup. How does it sound? Is it a deep low pitch sound?

  • #2
    <blockquote>quote:</font><hr> Originally posted by BirdmanV6:
    Is the Cat worth keeping?<hr></blockquote>

    Yes.
    94 Camaro 3.4 A4 <br />T-Tops<br />In the process of an LS1 swap.

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    • #3
      definitly keep it if you have smog tests in your state.
      1994 White Firebird 3.4L A4<br />Mods: K&N CAI RKSport Headers & SLP Loudmouth Cat Back <br />1969 Mustang Mach 1 351C M4<br />Mods: None yet......<br />~ Ryan

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      • #4
        .05 hundreths gain in E.T. with it.
        500 hundred dollars fine without it.
        <b>15.41</b> @ 89.80 & 15.45 @ <b>91.64</b>, 2.21 60ft, 3,440 raceweight, using <b>OEM</b> Equipment. <br />\'98 L67/M49 w/ 134,000 miles before spun bearing. \"<i>It\'s all stock, Baby</i>!\"

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        • #5
          Keep it, without it you wont pass Smog tests, and you will lose too much back pressure. I would go with a high flow, I got one on my car and it makes the car sound better at idle, and might help a little with performance.
          1995 3.4-Blackouts, 3 10\" MTX Subs, High flow cat, Faze voltmeter & air/fuel gauges Kenwood 800w amp,80\'s series Flowmaster, . ....more to come

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          • #6
            SAVE THE ENVIROMENT :mad:
            Cardomain

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            • #7
              <blockquote>quote:</font><hr>Originally posted by 95slowcar:
              Keep it, without it you wont pass Smog tests, and you will lose too much back pressure. <hr></blockquote>
              That is an untrue statement 95slo. The actual amount of backpressure the stock engine needs is much more minute than you are thinking. Any type of muffler, smaller than 3" will be more than enough for a stock V6.
              <b>15.41</b> @ 89.80 & 15.45 @ <b>91.64</b>, 2.21 60ft, 3,440 raceweight, using <b>OEM</b> Equipment. <br />\'98 L67/M49 w/ 134,000 miles before spun bearing. \"<i>It\'s all stock, Baby</i>!\"

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              • #8
                what's a smog test? [img]tongue.gif[/img] :D
                \'97 Pontiac Firebird A4 3.08/open<br />Best 60ft.: 2.411 Best 1/8: 10.262 @ 69.726 Best 1/4: 15.941 @ 87.48<br />Mods: SLP CAI, Loudmouth, Test Pipe

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                • #9
                  What everyone else said plus the fact that it will not sound good. If you want to experiment, try gutting it to see if you like it, with the thought that you could get a high flow cat and install that instead. A high flow cat would keep you legal, keep the car running cleaner with less stink, and give just enough back pressure with better flow capabilities in case you end up modifying later.
                  2004 CE Corvette 10.86@132mph
                  1996 Supercharged/Nitrous Camaro RS (For Sale)
                  2011 Cadillac CTS-V
                  2011 Mitsubishi Eclipse Spyder GT-P
                  2006 Mitsubishi Eclipse GS

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                  • #10
                    Shirl, Shirl, she's our girl! The sound of your car without a Cat will make us hurl!
                    Tom<br />Too many mods for this sig.<br /><a href=\"http://www.l337server.com/Tom/cars.html\" target=\"_blank\">My car\'s site</a><br /><br /><a href=\"http://www.FullThrottleV6.com\" target=\"_blank\">www.FullThrottleV6.com</a>

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                    • #11
                      whatever u guys, I have a 2.5' striaghtpipe right to my 80 series, it sounds so tight i cant even describe it. The car feels more powerful too
                      SLP CAI, RK Sport headers, P&Ped heads and intake, GT2 cam, Upgraded valvetrain, Z28 rear axle with 4.10s Tx Spd tune, Z06 rims, 2.5\" exhaust to flowmaster, 160* thermo, B&M ripper, upgraded ignition, rockford fosgate 12\" with sony xplode amp and HU.

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                      • #12
                        Shirl, Shirl, she's our girl! The sound of your car without a Cat will make us hurl!

                        [img]graemlins/rofl.gif[/img] [img]graemlins/love.gif[/img]

                        When I hollowed mine out, I left the hollowed cat (resonator) on there. It sounded extremely raspy... god aweful. It was embarrassing. It was just for experimental purposes though, to see how restrictive our exhausts are with aftermarket power adders such as the supercharger. I'm not sure what a straight pipe would sound like. Never heard one on our cars.. wish I did. Either way, a high flow cat is legal, excellent for performance and gives the car a deeper sound again.
                        2004 CE Corvette 10.86@132mph
                        1996 Supercharged/Nitrous Camaro RS (For Sale)
                        2011 Cadillac CTS-V
                        2011 Mitsubishi Eclipse Spyder GT-P
                        2006 Mitsubishi Eclipse GS

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                        • #13
                          I used to run with the same setup on my 3.4. I passed the emissions testing with the cat gutted, but it felt like I lost power. I wouldn't suggest it.
                          - Josh<br />If you have any questions or need installation pics/help, e-mail me: Viper98885@aol.com<br /><a href=\"http://Camaroz28.cardomain.com/id/viper98885\" target=\"_blank\">\'93 Camaro Hardtop</a><br /><a href=\"http://Camaroz28.cardomain.com/id/01lincolnls8\" target=\"_blank\">\'01 Lincoln LS8 Sport</a><br />\'00 Yamaha YZF-R6<br /><a href=\"http://www.ftpp.net\" target=\"_blank\">Full Throttle Performance</a>

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                          • #14
                            Get rid of it. I'm sick of my cat getting clogged. After installing my headers, its going straight to borla.
                            1997 Camaro Y87. Turbo.<br /><a href=\"http://pureoctaneracing.net/\" target=\"_blank\">Pure Octane Racing</a>

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                            • #15
                              dude you live in TX..we have that yearly smog test.

                              Without the cat you wont pass, well thats unless you take it to where i take it. Then your guaranteed to pass :D
                              My car has GPS trackin\',traffic alert,its own phone #,PS2,screens. And What da H3ll,When I Turn da key it says \"You\'ve got mail\"..... <br />I swear and promise.. I\'ve had more cars then Charlie Thomas.. bounces in a Monte\' that hopped.. Pimped old skoo Blazer on Chopz, Today Its a Camaro at all da plya spots.

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