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  • #1

    Muffler installed

    Hey guys, I just got the Hooker Aerochamber installed with 2.5" piping from the cat back. I went with a Magnaflow dual rolled tip. It looks nice, like it belongs there but not too flashy. Anyway, it ended up being A LOT louder than I thought it would be. That's not a bad thing though. I did notice some improvement while accelerating, it seems to wind out harder and not "lose steam as quickly." Any ideas as to what kind of gain I may have gotten?

    The only downside that it has is that there is a drone at certain points of throttle, but oh well, you can't have it all. Other than that it sounds pretty nice and I'm sure the 3400 UIM/LIM swap will benefit even better from this mod. Then comes the cam at tax season....

    Btw... pics will come soon. I don't have my camera with me at the moment.
    1995 "Driftwood Metallic" Cutlass Ciera

    Mods: K&N airfilter, Addco Front & Rear Swaybars, 2.5" cat-back exhaust w/ Hooker Aerochamber muffler.

    Down the road: Cam(?), 3400 ported UIM & LIM, ported heads.
    Tags: None
  • #2
    A new downpipe and cat would help too. If your downpipe is like other 3100's, it's 1.5" ID dual walled...
    sigpic New 2010 project (click image)
    1994 3100 BERETTA. 200,000+ miles
     16.0 1/4 mile when stock. Now ???
    Original L82 Longblock     with LA1, LX9, LX5 parts
    Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

    Comment

    • #3
      Originally posted by IsaacHayes View Post
      A new downpipe and cat would help too. If your downpipe is like other 3100's, it's 1.5" ID dual walled...
      It most likely is. I have to find a local performance shop that is willing to take the time to work on it. Too bad no one makes aftermarket ones or headers for the 60*.
      1995 "Driftwood Metallic" Cutlass Ciera

      Mods: K&N airfilter, Addco Front & Rear Swaybars, 2.5" cat-back exhaust w/ Hooker Aerochamber muffler.

      Down the road: Cam(?), 3400 ported UIM & LIM, ported heads.

      Comment

      • #4
        Originally posted by IsaacHayes View Post
        A new downpipe and cat would help too. If your downpipe is like other 3100's, it's 1.5" ID dual walled...
        Agreed. Someone i know put a 2.5'' DP on a near stock L82 grand prix. And it seemed to help out almost as much as my intakes did.
        1998 Monte Carlo LS, Dark Carmine Red Metallic.
        P&P 3400 UIM, LIM, And TB.
        Custom FWI / Descreened MAF.
        Polyurethane Dogbone Engine Mounts.
        MMS PCM, Dyno Tuned.
        180*T-Stat.
        Custom Shift Kit.
        Taylor ThunderVolt 8.2mm Spark Plug Wires.
        LQ1/LHO Oil Filter.
        GMPP Front And Rear STB's.
        SS Rear Brake Lines.

        Comment

        • #5
          If you don't have a section of pipe after the muffler going to the tips, it will have more drone that if you did. when I had my tips rust off (used cheap pipe of course to them) then the muffler droned really bad with no pipe/tip on it.
          sigpic New 2010 project (click image)
          1994 3100 BERETTA. 200,000+ miles
           16.0 1/4 mile when stock. Now ???
          Original L82 Longblock           with LA1, LX9, LX5 parts
          Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

          Comment

          • #6
            Originally posted by 1995 Gold Ciera View Post
            It most likely is. I have to find a local performance shop that is willing to take the time to work on it. Too bad no one makes aftermarket ones or headers for the 60*.
            You may want to think about changing the rear manifold to the center dump style, I think it has a larger outlet than the a-body offset outlet manifold.

            Comment

            • #7
              I am parting out my alero I have a magnaflow high flow SS cat and 2.5 down pipe I could remove and sell ? pm me

              Comment

              • #8
                PM sent...

                Anywho, does anybody have any ideas on how to deaden the sound a bit on the inside in general. I like it loud but I have two little ones and I don't want to hurt their ears.
                1995 "Driftwood Metallic" Cutlass Ciera

                Mods: K&N airfilter, Addco Front & Rear Swaybars, 2.5" cat-back exhaust w/ Hooker Aerochamber muffler.

                Down the road: Cam(?), 3400 ported UIM & LIM, ported heads.

                Comment

                • #9
                  That downpipe won' fit your car, or the flange on it.
                  sigpic New 2010 project (click image)
                  1994 3100 BERETTA. 200,000+ miles
                   16.0 1/4 mile when stock. Now ???
                  Original L82 Longblock                   with LA1, LX9, LX5 parts
                  Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

                  Comment

                  • #10
                    Originally posted by IsaacHayes View Post
                    That downpipe won' fit your car, or the flange on it.
                    Thanks for the heads up man. I'm not going to go that route right now anyway. I'm looking for the UIM & LIM (finally)

                    Anyway, a friend of mine told me that some sound deadening material under the trunk mat and behind the rear seat might help with the loudness. Is this true?
                    1995 "Driftwood Metallic" Cutlass Ciera

                    Mods: K&N airfilter, Addco Front & Rear Swaybars, 2.5" cat-back exhaust w/ Hooker Aerochamber muffler.

                    Down the road: Cam(?), 3400 ported UIM & LIM, ported heads.

                    Comment

                    • #11
                      Possibly, if the trunk is acting like a drum and vibrating due to the sound.

                      How long is the pipe that goes to the tips?
                      sigpic New 2010 project (click image)
                      1994 3100 BERETTA. 200,000+ miles
                       16.0 1/4 mile when stock. Now ???
                      Original L82 Longblock                       with LA1, LX9, LX5 parts
                      Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

                      Comment

                      • #12
                        Aerochambers are designed not to drone.. kinda strange.

                        Normally i have 2 layers of sound deadning carpet padding under my trunk carpet, plus with my back seat folded up mine isn't loud at all.. currently i have no interior.. just a drivers seat and yes, it is loud

                        Maybe some good automotive padding or some spray in sound deadener would help..
                        Past Builds;
                        1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
                        1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
                        Current Project;
                        1972 Nova 12.73@105.7 MPH

                        Comment

                        • #13
                          Originally posted by IsaacHayes View Post
                          Possibly, if the trunk is acting like a drum and vibrating due to the sound.

                          How long is the pipe that goes to the tips?
                          I believe the tip is connected directly to the muffler.

                          Normally i have 2 layers of sound deadning carpet padding under my trunk carpet, plus with my back seat folded up mine isn't loud at all.. currently i have no interior.. just a drivers seat and yes, it is loud
                          I think this may be the problem. Yesterday I lifted up the trunk carpet and there is some very cheap deadening material on the passenger side but absolutely NONE on the drivers side whatsoever or on the back of the rear seats. It's just the sheet metal on the trunk floor and springs on the seat. The thing that really makes me think it's the trunk is that it seems to sound okay on the outside but gets louder on the inside.

                          Is there a type of deadening material that you guys would recommend? I was planning on just doing what you did Dave and laying down a layer or two. I'm not gonna bother gluing it in case I ever want to take it out.
                          1995 "Driftwood Metallic" Cutlass Ciera

                          Mods: K&N airfilter, Addco Front & Rear Swaybars, 2.5" cat-back exhaust w/ Hooker Aerochamber muffler.

                          Down the road: Cam(?), 3400 ported UIM & LIM, ported heads.

                          Comment

                          • #14
                            Dynamat. sound deadening and antivibration as well.
                            Andy

                            sigpic

                            fastest 1/8: 10.19@ 67.17
                            fastest 1/4: 16.16@ 82.70

                            62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

                            Comment

                            • #15
                              If there was some pipe length to the tips it would help drone I bet.
                              sigpic New 2010 project (click image)
                              1994 3100 BERETTA. 200,000+ miles
                               16.0 1/4 mile when stock. Now ???
                              Original L82 Longblock                               with LA1, LX9, LX5 parts
                              Manifold-back 2.5" SS Mandrel Exhaust. Hardware is SS too.

                              Comment

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