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post #1 of 6 (permalink) Old 11-20-02, 05:50 AM Thread Starter
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eek Catalytic converters

Have any of you guys done any mods to your catalytic converters, like....maybe....knocking the guts out of them? Not really liked by the politicly correct amoung us....but just wondering if it makes a difference?

Bundy On!!
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post #2 of 6 (permalink) Old 11-20-02, 06:06 AM
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This is a very touchy question to ask because people dont often like talking about this sorta thing because of the whole 10,000 dollar tampering fine you might get. anyhow my mate did it to his eb when his cat shot itself, it made the car a bit louder, gave the exhaust a differant note and gave the slightest bit more grunt, the greatest thing he reackons is that he can get a few more k's out of the tank.

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post #3 of 6 (permalink) Old 11-20-02, 06:12 AM Thread Starter
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yeah, probably better off spending the 10 grand on some more......lets say "legal" mods lol
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post #4 of 6 (permalink) Old 11-20-02, 07:35 AM
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A good condition Cat only provides around 15% of the total restriction in a exhaust, the other 85% is the pipe size, mufflers, bends etc.

So lets say you run open headers and gain 30hp, only 4.5hp of that would be attributed to removing the cat.


Considering the amount of good the Cat does, and the fines associated with not having one, the small gain in Hp you may get isnt really worth it

There are easier ways to make Hp and still be street legal....

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post #5 of 6 (permalink) Old 11-20-02, 03:27 PM
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What Martin said is correct.The last thing I moded on my car was the cats after stg 3 ported Twisted Wedge heads,inlet, cam, etc etc. Believe me the std cats flow better than they look,hardly an improvement going to high flows.So a rather std engine would hardly benefit.
Besides as rev heads we want to keep the green house affect at bay, drive and live healthier..Or we'll be forced to drive electric vehicles...etc...

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
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post #6 of 6 (permalink) Old 11-20-02, 09:52 PM
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Re: Catalytic converters

Quote:
Originally posted by BundyBlackXR8
Have any of you guys done any mods to your catalytic converters, like....maybe....knocking the guts out of them? Not really liked by the politicly correct amoung us....but just wondering if it makes a difference?

Bundy On!!
Yes it makes quite a bit of difference high up in the rev range, and on my 96 v8 i get an extra 50km per tank from having none. But beware, on the v8 its about 3 times as loud, and the engine dosent sound too good when theres gasses whistling through hollow cats at 10 million litres per second.

I recomend you just get better/bigger ones, i hate the noise factor.

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