Maxima 99 Hi Flow CAT Catalytic Converter

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01-15-2004, 10:13 AM

chak210

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Maxima 99 Hi Flow CAT Catalytic Converter

I have a 1999 GLE. I bought a Hi flow CAT Catalytic Converter If I remove the stock catalitic and replace it with the new one which I got recently, will it kill my car or will I get CHECK EIGINE light. What are you suggestions?

01-15-2004, 10:16 AM

DAVE Sz

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The one from EBAY? That costs like $50 or so? It's not even a cat, at least mine wasn't. It's just a metal pipe that takes some power away from your car. I had 3 or 4 different kinds of CATS and they all suck compared to the stock one.

01-15-2004, 10:28 AM

happyricefob

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replacing stock cat will not give you any HP. in addition you are polluting the environment. put back your stock cat...

01-15-2004, 11:13 AM

nismos14

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some people have seen gains of 1-3 hp. if you want to put it on put it on, it shouldnt give you a CEL

01-15-2004, 11:56 AM

mymaxlvsattn

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You Cant get a CEL from changing the Cat out due to the fact that their are no sensors post-cat. you could leave everything past the y pipe off completely and your car wouldnt know the difference. Now Your ears definitely would and Im sure the birds and trees would frown on it.

01-15-2004, 03:42 PM

chak210

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You saing it worthless, but from my own experience my friend changed his intake to K&N intake and he installed Hi flow CAT his car feels more fast from take off

01-15-2004, 04:30 PM

Vyrus

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Quote:

Originally Posted by mymaxlvsattn

Actually there is a post-cat O2 sensor. In the '95-'96 it is in the car, and in the '97-'99 it is after the cat. A word to the wise: Most aftermarket cats and test pipes that are marketed for '95-'99 are really for '97-'99 since they do have have an O2 sensor input, and you must have this welded in. And driving with the O2 sensors not plugged in may set of a CEL after a few drives.

But either way you will see MINIMAL performance increases (most likely nothing on the butt-dyno) and it is very bad for the environment to get a test pipe. If you want a high flow cat just to www.WarpSpeedPerformance.com or www.Cattman.com and stick with one of those - they are environmentally safe but very costly and again provide little to no horsepower/torque gains.
-Cyrus

01-15-2004, 05:03 PM

DAVE Sz

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Quote:

Originally Posted by chak210

You saing it worthless, but from my own experience my friend changed his intake to K&N intake and he installed Hi flow CAT his car feels more fast from take off

Your friend is either drunk or on crack 24/7. A high flow CAT will reduce your low RPM power like MOST of exhaust mods do. I have a y-pipe and a cat-back and the car is WEAKER of the line than when it was stock.

01-15-2004, 06:27 PM

Mizeree_X

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Quote:

Originally Posted by Big D

I just changed my hi-flow cat to a regular one. My low-end improved, but I lost a decent amount of high end. I guess it all depends on what type of power you want to make whether you consider this mod 'useless' or not.