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  • true duals, cats or no cats

    I'm in the process of making a true dual system for my car, I already have a 2.25" universal summit h-pipe, 2 2.25" magnaflow 10415 mufflers, and the upper panhard rod relocation kit so I can go over the axle with the pipes. I'm not worried about emissions testing since NC doesn't do the sniffer, and I have a few family members that won't do the visual either. I also already have the rear o2 sensor tuned out so throwing a code isn't a problem either. Will the exhaust be too loud inside the car for daily driving without the cats, or should I just go ahead and get a couple high flows and put them on? All I'm worried about here is interior drone on the highway.

    I know true duals aren't cost effective, and I know I won't see much, if any increase in power over my current exhaust. This is just something I've been wanting to do for a very long time.

  • #2
    Re: true duals, cats or no cats

    I have a TD set up with an X pipe on my '00 car, I went with no cats. It is loud, but at crusing speeds it's not as bad as you'd think. Acceleration is when it might bother you in the car. I love mine though.
    3M MAFIA
    ________
    | Dynomax Catback | Auburn Posi | 3:42s | B&M Ripper | DIY CAI | PVC Mod |
    Next on the list: GT2 Cam| 105# Springs |Headwork| Headers |
    sigpic

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    • #3
      Re: true duals, cats or no cats

      Hey, just turn up the radio...eventually it will be like a head ache that never goes away.
      Phil

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      • #4
        Re: true duals, cats or no cats

        I don't think it'll be too bad since I'm running it out the back instead of dumping it. Plus I can always add them later.

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        • #5
          Re: true duals, cats or no cats

          If your running it out back you'll be fine. Mines 3" dumped before the axle and its pretty loud even with a resonator in place of the CAT and dynomat throughout the car. I wouldn't run CATS if I had the choice, I would run resonators if it was too loud.
          08' L76 6.0L 4X4 Chevy EXT.Cab LTZ Vortec MAX with Snug top cover, Dynomax exhaust,Hptuners& K&N intake
          96' Camaro M5 to A4 conversion, alot of mods ,see Homepage. GT35R Turbo http://www.cardomain.com/ride/244123...vrolet-camaro/
          https://www.facebook.com/steve.starcher.18

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          • #6
            Re: true duals, cats or no cats

            I was considering buying some pre-bent piping from summit, something like this http://www.summitracing.com/parts/sum-670145

            Living in NC the car rarely sees salt on the roads or snow; so is it really necessary to go stainless steel?
            Last edited by 02firebird; 06-02-2014, 10:21 AM.

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            • #7
              Re: true duals, cats or no cats

              You could buy that, summit has X and H pipe kits you could buy as well and just add on from there. I bought their X pipe kit.
              3M MAFIA
              ________
              | Dynomax Catback | Auburn Posi | 3:42s | B&M Ripper | DIY CAI | PVC Mod |
              Next on the list: GT2 Cam| 105# Springs |Headwork| Headers |
              sigpic

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              • #8
                Re: true duals, cats or no cats

                I have Borla and I run it open. It's got a nice sound to it. Nothing raspy about it either.

                I wish I could go no Cat, but that's a HUGE NO, NO in Calif.

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                • #9
                  Re: true duals, cats or no cats

                  You have the adjustble borla with the plates you swap out? I thought about trying to find a used one and put an electric cutout in place of the plates.

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                  • #10
                    Re: true duals, cats or no cats

                    You will not regret true duals. Just make sure you have a good diagram plan for how you want it. I had it done out the back without any panhard modification and it wasn't pretty. Anyway now it's dumped with 2.5 Borla Pro XS's and I LOVE it. I get a lot of compliments on how it sounds and those unfamiliar with the Ls1 roar mistake it for an 8. I have a high flow cat where the stock one once was and nothing on the drivers side. I don't think not having it will make a difference just go with a good muffler. Magma flow was my second choice if I couldn't get borlas. Good luck buddy

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                    • #11
                      Re: true duals, cats or no cats

                      Originally posted by 02firebird View Post
                      You have the adjustble borla with the plates you swap out? I thought about trying to find a used one and put an electric cutout in place of the plates.
                      Yes, those plates. Sad part is I accidentally threw my plates away when I was cleaning the garage. :twak:

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                      • #12
                        Re: true duals, cats or no cats

                        I hated my true duals with magnaflow bullets. They came out the back and looked awful, not to mention it sounded like an import on steroids.

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