I've got a 3 1/2 " down pipe to a 3" Random Tech High flow cat
with Greddy sp exhaust on my 94 tt bpu'd ++ 6 speed
Car recently tuned up

County initiated emmisions testing
Bought this cat beliviing it would pass emisions
I have orig exhaust and someone good with a cutter and wielder
Will OEM main cat replacing Random Tech cat
pass emissions
Nox numbers extremely high and HC numbers elevated
Mechanic blames cat not burning enough
Other issues with car?
WTF

Thanks

You might try some RXP fuel additive. I heard some really good things about it bringing down emmisions enough to pass inspections...
Good luck,

Shane

quote:

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Originally posted by TXsupra:
I've got a 3 1/2 " down pipe to a 3" Random Tech High flow cat
with Greddy sp exhaust on my 94 tt bpu'd ++ 6 speed
Car recently tuned up

County initiated emmisions testing
Bought this cat beliviing it would pass emisions
I have orig exhaust and someone good with a cutter and wielder
Will OEM main cat replacing Random Tech cat
pass emissions
Nox numbers extremely high and HC numbers elevated
Mechanic blames cat not burning enough
Other issues with car?
WTF

Thanks

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Do you have any fuel mods? EGR block off? 12V mod? Fuel dampener bypass? most likely fuel mods can cause you to fail horribly on emmisions.

Maybe get a tuner to tune a fine tune fuel computer(like feilds SAFC) to clean it up abit. how long did you let it warm up? hot cars burn cleaner. Technically. run a tank of 100 unleaded to clean out the injectors then go test with 91 with hot car. also look for other emmision thread I posted about emmisions in general I think.