LT1-LT4 Modifications 1993-97 Gen II Small Block V8

suggested header and catted y-pipe?

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Old Aug 24, 2010 | 10:37 PM
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Default suggested header and catted y-pipe?

Hey all I'm trying to help my friend who recently got a 94 Z28 with when he wants to do headers and a catted y-pipe...for now I believe hes gonna go with a magnaflow exhaust but just curious what headers and catted y-pipe are considered good (i.e. ones that fit well, coated, and he wants to retain having cat(s)) when he wants to upgrade down the road? (I own a 96 Impala SS so im def in the LT1 scene but I don't know the good F-body LT1 stuff)
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Old Aug 25, 2010 | 09:14 AM
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I don't believe anyone makes a catted y-pipe for longtubes. I just bought the off road y and put cats in it. Pacesetters coating sucks so don't waste your money on that. Their slip fit collectors are a pain to get apart if you ever have to. If budget is not a problem Kooks stainless are a good choice. Otherwise Jethot coated Hookers would be my second choice. Here are pics of my cattted y-pipe



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Old Aug 25, 2010 | 10:04 PM
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Ok so what about mid-length headers? are they're some that are considered good? as in fitment, coated, and work with a catted y-pipe? Much loss in HP/torque gains with only going with mid-lengths over longtubes?
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Old Aug 26, 2010 | 07:37 AM
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MAC makes mids with catted y but only have 1 5/8" primarys so not sure what the end goal is for the car but all LT's have 1 3/4"
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Old Aug 26, 2010 | 08:16 AM
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Kooks make a catted y to go with there long tubes iirc.
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Old Aug 26, 2010 | 12:26 PM
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I am getting ready to change up my exhaust and am going to be selling a set of emissions long tube pacesetters, and y pipe with magnaflow hi flow bullet cats in each leg of the y and v bands at the collectors. I am also getting rid of a magnaflow 3" stainless catback with corsa clones out back. Where are you located?
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Old Aug 26, 2010 | 02:23 PM
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Hey:

If he is willing to do mods the Ebay stainless steel or LPP 321 Stainless headers, just add cats to the y. If going Kooks get the 1 3/4" not the stepped ones, as the LPP and Ebay clones are very much like the stepped Kooks at 1/3rd the price, with the same install issues.

Dub
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Old Aug 26, 2010 | 03:20 PM
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Unless they've quit, Kooks does make a catted y-pipe.

I can say that my 1 3/4" Kooks went in without issue.
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Old Aug 26, 2010 | 11:32 PM
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we are in the tidewater, va area...also since he has a 94 Z28 is it right that his car is a single cat y-pipe while the kooks one i found has 2 cats and looks like they have after-cat O2 sensor bungs installed for both cats, does his 94 even have post-cat O2s at all?
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Old Aug 26, 2010 | 11:44 PM
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Buy what ever LT header you want and get two hi flow cats. Weld them up to the collectors, run the y pipe from there to the single going to the rear of the car.
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