Fake cat (meow :) )

["Randy B" <scirokn81@email.msn.com>]

>At 02:13 PM 2/14/00 -0800, Randy B wrote:
>>
>>Eric,
>>That sounds like a good idea, but a couple questions.


Eric wrote:
>well at least it seemed like a good idea at the time;)


He he he. They will probably put that on my gravestone. :)

>>1. If you use a high flow cat. and 2" exhaust instead of the
>>stock one and the 1 5/8"? stock exhaust you gain a few hp
>>from less restriction right?
>
>yep, right


>>2. How much extra hp are you gaining with the straight pipe
>>idea over the 2" high flow cat with 2" exhaust?
>
>none but thats not the point.  He said he wanted to pass the VISUAL test
>and a straight pipe cat would *probably* do this.  It should also not
>affect power much, if at all over no cat.  It is also cheaper that 200 or
>so for a high flo cat.

Tell me about it, it was the most expensive part of my exhaust system.

>I dont think he was looking for more performance but at the same time i
>dont think you would want worse performance either.

>>3. Will it pass the sniffer test without a cat.
>>
>>I have considered this in the past but I always feared
>>not passing the sniffer so I got a high flow 2" cat.
>
>No idea, havent ever had to worry about it (gotta love Iowa for that).

Unfortunately out here in CA they are very strict. :(

>I've got nothing but a super turbo and 2 1/4".  I would guess that he
>should have no problems passing given a good running engine.  IMO, cats are
>shit and do next to nothing anyway.
>   I also remembered after i posted that you arent *supposed* to be able to
>buy used ones in a yard, but if you knew anyone that worked at one im sure
>they would let you throw a couple in your trunk if you were buying some
>other stuff.  Or if someone had one sitting around in their garage you
>could get one that way.

I have a used stock one off of my 81S that still has all the honeycomb stuff
intact if anyone want's it.

>hope i answered your ?'s, dont think for a second that I'm experienced in
>actually doing this:)  I've never made a fake cat before, nor do i need to;
>but im pretty sure it would work.
>just throwin out ideas to see if i can help out.


Thanks, I'm not a mechanic either just a tinkerer. Ideas are what make this
list such a great resource, Keep em' comin'.

-Randy

Eric wrote earlier:
>>>go find any old cat in a junkyard that is a little bigger than your
pipe(ie
>>>2 1/4" if you have 2") and not rusted out, hollow it out so you can see
>>>through it and put a piece of pipe inside it thats the same size as your
>>>exhaust.  Weld the sucker up and youve got an instant straight pipe "cat"
>>>for not much cash.  Shouldnt restrict flow any either if you use the same
>>>size pipe.
>>>
>>>Eric Person
>>>86.5 16v (w/no cat)
>>>
>>>At 02:16 PM 2/14/00 -0800, M. Hansen wrote:
>>>>Hi All:
>>>>Just installed a tt downpipe and exhaust I got for $50 off of a wrecked
>>>>GTI.  Sure wakes up the old beast and it finally sounds as healthy as
>>>>the rest of the cars in my garage.  Really like that raspy sound above
>>>>4000 too.  My problem is that I am facing emission testing for the first
>>>>time in 6 months and they do a visual inspection for a cat converter.  I
>>>>really don't want to ditch the downpipe for a tt cat downpipe so I was
>>>>thinking of installing a cat right behind the downpipe after the shift
>>>>box.  Physically there is enough room and this would let me pass the
>>>>visual test.  I'm not so concerned about the effectiveness of the cat so
>>>>far back from the engine.  My friend with an 84 Rabbit installed a built
>>>>2.0L 8-valve last year and passed emissions with flying colours not soon
>>>>after.  this was with g-grind, 10:1 comp, and porting.  So I figure that
>>>>my 'roc should pass easily as well.  What are your experiences with this
>>>>and do you have any suggestions?  Any help is appreciated.
>>>>
>>>>Mike Hansen
>>>>83 Scirocco GT







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