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    Thread: 1984 GTI benefits of removing cat?

    1. 08-27-2012 12:45 AM #1

      My first car was a 1980 Rabbit. I bought it in 1984. I had it and got it smogged every two years and after about 8 years the smog tech told me the car didn't have a cat, in its place was a "test pipe". This is how I purchased the car. Funny thing is that he was the same tech that passed me the years before. So I went to to the junk yard and purchased a cat (this wouldn't be possible today).

      So I still have the test pipe and I also have a 1984 gti rabbit, same flanges and size.

      Was curious if I would gain an benefits of removing the cat. And if so what would they be?

      I remember years ago reading something about CIS depends on the backpressure of the cat to work properly? Is this so?

    2. Member Esevw's Avatar
      Join Date
      Dec 27th, 2002
      Tacoma, WA
      83 rabbit GTI
      08-27-2012 03:49 AM #2
      You would get better flow through the exhaust. That's all I know, not too sure if it would affect the cis. I've ran a few rabbits with no cat and cis with no problems.

    3. Semi-n00b aoppermann's Avatar
      Join Date
      Sep 23rd, 2009
      1987 Scirocco 8v/2000 Passat 1.8T
      08-27-2012 02:19 PM #3
      i have an 86 scirocco and cis injection and i havent had any problems. just a little extra oomph through the exhaust

    4. Member
      Join Date
      Apr 16th, 2006
      Brokelyn, NY
      90 fox, 85 gli
      08-28-2012 06:04 PM #4
      If you don't have to worry about smog and don't personally worry about smog, you could stand to benefit a bit from the freer flowing exhaust. As far as CIS, it shouldn't need any adjustments and should run just fine.

      Does the car have any other mods? 84 gti came with dual downpipe?
      I really suck at smog.

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