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Gut pre cats while in SVT?

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  • Gut pre cats while in SVT?

    Hello everyone, I have tried searching the forums about this. Is it possible to gut the pre cats on my 98.5 SVT? I made some mil eliminators, will I put them on the O2 sensors AFTER the pre cats? I'm pretty sure that's where they need to go.

    What I'm really looking for is a little more sound and maybe a little more power. I plan to do a 3L swap when time and $$ permits but for now I'm looking for a cheap easy way to increase the sound of my SVT.

    Thanks for the help and for all of the info in these forums! It's truly amazing!


    Sent from my iPad using Tapatalk
    1998.5 E1 SVT Silver frost #5850
    1999 SVT Black - Dead, RIP

  • #2
    I recently gutted my pre cats. I'm very happy with the improved should. You probably could gut the one next to the fire wall. That depends on how much room you have under your car. The front is a little harder and is actually easier to remove.

    Your mil eliminators do go on the down stream o2 sensors.

    Lots of info on 3l options just search a little and you'll find a lot.
    98 Silver Frost
    Full 3.0L
    ST220 intake w/ f150 tb

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    • #3
      Thanks a lot for the response. So it sounds like your saying I can pull the front header without too much issue? I have read that changing headers while the engine is still in the car is a huge PITA. That bust be because of the rear side header.

      Thanks for the answers! I think I'll go for it this weekend.


      Sent from my iPad using Tapatalk
      1998.5 E1 SVT Silver frost #5850
      1999 SVT Black - Dead, RIP

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      • #4
        To make the rear easier to pull, remove the studs. It sits close to the alternator. Not impossible but not easy.
        98 Silver Frost
        Full 3.0L
        ST220 intake w/ f150 tb

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        • #5
          Thanks for the tip!


          Sent from my iPad using Tapatalk
          1998.5 E1 SVT Silver frost #5850
          1999 SVT Black - Dead, RIP

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          • #6
            It can definitely be done in place, and realistically its probably not worth the trouble trying to take them out at all.
            I started with this how to:
            http://tutorials.newcougar.org/HowTo...andPreCats.pdf
            But did it without removing:
            http://www.newcougar.org/forums/2-5l...s-learned.html
            Your car is uglier than I am! uh...that didnt come out right.

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            • #7
              In order to remove the front one you will need to drop the radiator and cooling fans. I have been told you can drill into the front manifold to gut it but you will need to weld the hole shut. This way you don't have to drop the radiator. The rear one isn't hard at all to gut. Basically if nothing is wrong with them.....I wouldn't gut them. I would wait until you do your 3l. Only reason you should gut your pre cats on a stock motor is if they are clogged.
              -99 E1 Black/MNB #1974 stock DD
              -98 E0 Black/MNB #0812 3L sold
              -98 E0 T-Red/MNB #0322 sold

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              • #8
                You don't have to drop your radiator for the front manifold.
                98 Silver Frost
                Full 3.0L
                ST220 intake w/ f150 tb

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                • #9
                  Originally posted by squeek View Post
                  You don't have to drop your radiator for the front manifold.
                  Well maybe not but I'm sure it would be much easier if you did.
                  -99 E1 Black/MNB #1974 stock DD
                  -98 E0 Black/MNB #0812 3L sold
                  -98 E0 T-Red/MNB #0322 sold

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                  • #10
                    I'm getting codes telling me O2 and cats are bad... I'm also going to install MIL eliminators. Will gutting the cats make her a little louder? I found a how to that did involve drilling a hole in the front but I can easily weld that up without any issues. Seems like it would be cheaper and more effective than replacing BOTH O2 sensors and still possibly needing new precats...

                    Thoughts?
                    1998.5 E1 SVT Silver frost #5850
                    1999 SVT Black - Dead, RIP

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                    • #11
                      This is the "tutorial" I found:

                      http://www.angelfire.com/super2/contoursvt/Gut.html

                      Looks pretty good minus the screw to seal it back up...
                      1998.5 E1 SVT Silver frost #5850
                      1999 SVT Black - Dead, RIP

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                      • #12
                        A little louder, a little more responsive (maybe), better gas mileage, no real cost, no other drawbacks...Do it.
                        Removing the manifolds is not required
                        Your car is uglier than I am! uh...that didnt come out right.

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                        • #13
                          Originally posted by Jbalch View Post
                          I'm getting codes telling me O2 and cats are bad... I'm also going to install MIL eliminators. Will gutting the cats make her a little louder? I found a how to that did involve drilling a hole in the front but I can easily weld that up without any issues. Seems like it would be cheaper and more effective than replacing BOTH O2 sensors and still possibly needing new precats...

                          Thoughts?
                          yes .. what are the O2 sensor codes? More often then not getting O2 sensor codes along with a pre-cat code(s) means the pre-cat codes are false. BTW you need working O2 sensors to use with the mil-eliminators, so might as well chagne out the O2 sensors, depending on the codes, and go from there.
                          - 12 Focus SE
                          - 99 Contour SeVT <- 3L/NPG Turbo
                          - 2k Contour SVT - #2137

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                          • #14
                            I can't remember the codes, there were 5 of them. one was P0420 and the other was the same but the other side and I thing both O2 codes. I will scan again once my CEL comes back on (replaced alternator this weekend and no codes have come back yet, I even got it to pass emissions today).
                            1998.5 E1 SVT Silver frost #5850
                            1999 SVT Black - Dead, RIP

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                            • #15
                              The 0420 code is for catalysts below efficiency, but those codes often come up when the catalysts are working fine, and it's just an oxygen sensor issue that causes it.

                              Would be nice to know that the actual diagnostics were before everyone starts troubleshooting.
                              2000 3.0 Roush Cougar
                              2013 Focus ST
                              2002 MINI Cooper S
                              2008 Mustang Bullitt # 5389

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