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  4. Turbo car. Cat or no cat.

Turbo car. Cat or no cat.

Scheduled Pinned Locked Moved Car Tech
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  • mx6phanM Offline
    mx6phanM Offline
    mx6phan
    wrote on last edited by
    #12

    I just took mine off before I pulled in. They owner said the law states that they only have to put one on if it came in with one.

    Earl Stanley MSN- [email protected]
    93 Mazda MX-6 2.0 13.6@104mph (9psi) Daily Driver
    94 Ford Probe GT (new project)

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    • ? This user is from outside of this forum
      ? This user is from outside of this forum
      Guest
      wrote on last edited by
      #13

      94NDTA wrote:
      What is the difference (HP wise) between a turbo car with a high flow cat or no cat at all. The reason I ask is my buddy got a new 3 inch exhaust for his turbo daytona, but had the put on a high flow cat. Is there a big difference in hp?

      I think he should stick with the cats. I think its going tobe kinda loud. To the point where he's going to wish he left the cats on.

      Take the cats off and see how he likes it?

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      • K Offline
        K Offline
        KA-T_240
        wrote on last edited by
        #14

        gunmaster wrote:
        I think he should stick with the cats. I think its going tobe kinda loud. To the point where he's going to wish he left the cats on.

        Take the cats off and see how he likes it?

        but if you do this youll need a test tipe or something there a HUGE differance in running open DP or no cat.

        PM me for:
        Sandblasting(I use glass beads)
        Diesel repairs or performance products.

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        • JohnWJ Offline
          JohnWJ Offline
          JohnW
          wrote on last edited by
          #15

          In my personal experience, I like my car alot better with a cat on. I had a small round magnaflow high flow cat put on, and it made my car quite a bit quieter, especially at idle. Also it stinks alot less at stoplights, and I think I got a little low end back (lost some top end, but I don't really use the top end that much)
          A cat may affect horsepower a bit, but not much, and unless you are squeezing every last bit out of the car already, you could get that back somewhere else. I think for me, the cat was a great decision and i'm very happy with it. YMMV

          90 Civic DX hatch
          D16a6/y8 mini me

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          • D Offline
            D Offline
            dynotune
            wrote on last edited by
            #16

            depending on application you WILL NOT lose much power at all if you have a GOOD converter. I have made 600 plus to the wheels w/ them and alot of cars sound better with them in place. People that pick up horsepower w/ no converter is generally due to the cats being plugged. Good converters on a supercharged car will INCREASE the HP. I would advise him to leave the converter alone.

            DynoTune Speed & Performance
            Custom EFI Programming for Ford, GM, and all others
            Mobile chassis dyno service
            www.dynotuneusa.com
            (605) 753-1101

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            • SmitEvoS Offline
              SmitEvoS Offline
              SmitEvo
              wrote on last edited by
              #17

              I love my car with no cat and it isnt even that loud.....:p I am guessing once I put on the 3inch turbo back I gained 20-30 hp.

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              • Sweet-WRX-LovinS Offline
                Sweet-WRX-LovinS Offline
                Sweet-WRX-Lovin
                wrote on last edited by
                #18

                dynotune wrote:
                depending on application you WILL NOT lose much power at all if you have a GOOD converter. I have made 600 plus to the wheels w/ them and alot of cars sound better with them in place. People that pick up horsepower w/ no converter is generally due to the cats being plugged. Good converters on a supercharged car will INCREASE the HP. I would advise him to leave the converter alone.

                There's the answer you were looking for. A really good high flow cat only becomes a significant restriction at ridiculous amounts of power and up. I grew up around the smell of unburnt gas so it's no cats for me. I love it. I said I love it.

                One time...

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                • ? This user is from outside of this forum
                  ? This user is from outside of this forum
                  Guest
                  wrote on last edited by
                  #19

                  Sweet-WRX-Lovin wrote:
                  I love it. I said I love it.

                  This moment brought to you by Mr. Bartz (only Harvey people will have any idea what I'm talking about):icon_rr:

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                  • ZeroZ Offline
                    ZeroZ Offline
                    Zero
                    wrote on last edited by
                    #20

                    BAH! you might notice a slight difference without a cat. There aren't any tests, so you don;t have to worry about emissions. while you're at it, put a spark plug in the tail pipe.

                    600 whp on a dynojet doesn't get my pants tight. 😉

                    Chocolate Rain ;)

                    MPI conquest

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                    • ? This user is from outside of this forum
                      ? This user is from outside of this forum
                      Guest
                      wrote on last edited by
                      #21

                      Lose the cat., put in a test pipe. Chances are you'll melt the catalyst and end up with a plugged exhaust, if you're looking at a bigger turbo and most likely fueling adjustments.

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                      • ErikE Offline
                        ErikE Offline
                        Erik
                        wrote on last edited by
                        #22

                        Cats are for Californians.

                        They call me, old man...

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                        • 94NDTA9 Offline
                          94NDTA9 Offline
                          94NDTA
                          wrote on last edited by
                          #23

                          He is shooting for the 425-450 whp mark. IT is allready really quiet for a 3 inch exhaust, I don't think it would be much louder without a cat.

                          legacy image

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                          • PSiedTSiP Offline
                            PSiedTSiP Offline
                            PSiedTSi
                            wrote on last edited by
                            #24

                            Pressbent?

                            At first I did it for fun, then I realized I made the investment and had to do it!

                            92 Talon AWD 6/4bolt [EMAIL="[email protected]"][email protected][/EMAIL]
                            95 240SX SE SR20DET [EMAIL="[email protected]"][email protected][/EMAIL]
                            1993.5 Supra Hardtop...Sold
                            Next project? 6cyl, 6spd?

                            > spanish-rice;237125 wrote:
                            > at first i thought the title said beer truck drivers needed... In which case i accidently put my two weeks in at work.

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                            • 94NDTA9 Offline
                              94NDTA9 Offline
                              94NDTA
                              wrote on last edited by
                              #25

                              PSiedTSi wrote:
                              Pressbent?
                              What ever exhaust pro's is. I don't think it was mandrel, but it wasn't wrinkled.

                              legacy image

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                              • PSiedTSiP Offline
                                PSiedTSiP Offline
                                PSiedTSi
                                wrote on last edited by
                                #26

                                94NDTA wrote:
                                What ever exhaust pro's is. I don't think it was mandrel, but it wasn't wrinkled.

                                So then it's technically 2.5'' since 3'' pressbent corners flow like 2.5''.

                                At first I did it for fun, then I realized I made the investment and had to do it!

                                92 Talon AWD 6/4bolt [EMAIL="[email protected]"][email protected][/EMAIL]
                                95 240SX SE SR20DET [EMAIL="[email protected]"][email protected][/EMAIL]
                                1993.5 Supra Hardtop...Sold
                                Next project? 6cyl, 6spd?

                                > spanish-rice;237125 wrote:
                                > at first i thought the title said beer truck drivers needed... In which case i accidently put my two weeks in at work.

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                                • JoelJ Offline
                                  JoelJ Offline
                                  Joel
                                  wrote on last edited by
                                  #27

                                  Exhaust pro's has a mandrel bender now...

                                  no race car? becuz homeowner...

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                                  • 94NDTA9 Offline
                                    94NDTA9 Offline
                                    94NDTA
                                    wrote on last edited by
                                    #28

                                    wannabe wrote:
                                    Exhaust pro's has a mandrel bender now...
                                    Yeah, it looked like it was mandrel bent, but I always thought SLS was the only mandrel bent shop in town, so I didn't even look that close at it.

                                    legacy image

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                                    • JoelJ Offline
                                      JoelJ Offline
                                      Joel
                                      wrote on last edited by
                                      #29

                                      press bent looks like a cambels soup can when its bent, all ripply and shit, mandrel looks like u would think a pipe bend should look, clean and somewhat uniform.

                                      no race car? becuz homeowner...

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                                      • 94NDTA9 Offline
                                        94NDTA9 Offline
                                        94NDTA
                                        wrote on last edited by
                                        #30

                                        wannabe wrote:
                                        press bent looks like a cambels soup can when its bent, all ripply and shit, mandrel looks like u would think a pipe bend should look, clean and somewhat uniform.
                                        Yeah, it was very nicely done. It was NOT pressbent then. He said it was ~$200 less than he got quoted at SLS, but he got a discount.

                                        legacy image

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                                        • JoelJ Offline
                                          JoelJ Offline
                                          Joel
                                          wrote on last edited by
                                          #31

                                          Well with an in house mandrel bender, you can move stuff quicker. But i guarentee that Nicks welds are better than the poop they do at exhaust pros. Spanish-Rice shoul dpost up a pic of his sweet downpipe they made him...

                                          no race car? becuz homeowner...

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