C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

catalytic converters

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Old Dec 28, 2010 | 01:39 PM
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I have to replace the front Y/wcats and the catalytic converter. With all the products out there, how do I know which ones are the best to use on my 1989 5.7 6 speed stock corvette?

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Old Dec 29, 2010 | 07:28 AM
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I presume they are made to a standard (for emissions reduction) so you should be able to compare each one against the standard. Their product brochures should detail their specs.
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Old Dec 29, 2010 | 10:00 PM
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If you can get away with it get a front y with no cats,otherwise Magnaflow has a replacement y with cats. I also recommend a Magnaflow center cat.

Here was my l98 with Headman headers .. Magnaflow cat and cat back.

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Old Dec 29, 2010 | 10:39 PM
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Originally Posted by DEK
With all the products out there, how do I know which ones are the best to use on my 1989 5.7 6 speed stock corvette?
Define what you mean by best! If you're looking for factory-replacement, there are 50-state legal converters you might want to look at. If you're looking for best power with decent-to-possibly-legal emissions control, then Magnaflow (Car-sound.com) has my vote for best value/price. Random Tech is considered THE BEST flowing cat made but you have to PAY for it.

Do you have emissions or sniffer testing in your area? Is your goal best power gain?
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Old Dec 30, 2010 | 11:54 AM
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Originally Posted by GREGGPENN
Define what you mean by best! If you're looking for factory-replacement, there are 50-state legal converters you might want to look at. If you're looking for best power with decent-to-possibly-legal emissions control, then Magnaflow (Car-sound.com) has my vote for best value/price. Random Tech is considered THE BEST flowing cat made but you have to PAY for it.

Do you have emissions or sniffer testing in your area? Is your goal best power gain?
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