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

Y-Pipe

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Old Apr 25, 2002 | 01:39 PM
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WAF
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Default Y-Pipe

Will the Y-Pipe on an '85 without cats fit on an "89 to replace the pre-cat Y-pipe?

Thanks.
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Old Apr 25, 2002 | 01:44 PM
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Default Re: Y-Pipe (WAF)

If the cat is bolt front it won't fit as the later cats are slip front. Otherwise it may bolt up.
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Old Apr 25, 2002 | 01:47 PM
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Default Re: Y-Pipe (65Z01)

the cat is different, if you replace it, you could get it to bolt up correctly
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Old Apr 25, 2002 | 02:21 PM
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Default Re: Y-Pipe (WAF)

I have not tried this, but almost did.

85 pipe is supposed to be a little longer to the flange. Diameter is supposed to be the same as required to clamp to the 89 cat. So if all of this is true, you could cut the flange off the 85 and a little of the pipe and clamp it to the cat.

Never tried, but a guy on this forum measured it and it seemed as though it would work. Maybe somebody has done it to see.

Pete
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Old Apr 25, 2002 | 09:58 PM
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Default Re: Y-Pipe (WAF)

Why not buy an after market pipe. They can be had in SS and in mandrel bent 2 1/2" tube. The flow would be better than a stock later model pipe.
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