98 5.7 vortec 1 7/8 crimped - hurting power?

[df2x4]

One piece of the Y has one cat, and the other piece of the Y has the other cat.

Unless of course your half ton is a 4.3 or 5.3 truck. Then the Y is designed differently with a single cat after the head pipes combine.

If we're nitpicking, we might as well cover everything.

 

[slowburb]

Unless of course your half ton is a 4.3 or 5.3 truck. Then the Y is designed differently with a single cat after the head pipes combine.

If we're nitpicking, we might as well cover everything.

Remember that the thread (derailed as it may be) is titled "98 5.7 vortec 1 7/8 crimped - hurting power?"

 

[df2x4]

Remember that the thread (derailed as it may be) is titled "98 5.7 vortec 1 7/8 crimped - hurting power?"

Indeed, but with all the derailment going on I just figured it couldn't hurt to point out that difference.

 

[skylark]

Unless of course your half ton is a 4.3 or 5.3 truck. Then the Y is designed differently with a single cat after the head pipes combine.

If we're nitpicking, we might as well cover everything.

Actually if we are talking 800's with an LS platform, that y pipe is beautiful! I have one from a 2000 4.8 2wd and the pipe is MUCH larger and it has nice bends.

 

[df2x4]

Actually if we are talking 800's with an LS platform, that y pipe is beautiful! I have one from a 2000 4.8 2wd and the pipe is MUCH larger and it has nice bends.

I've actually never seen an 800 Y pipe, the one I'm referring to is this little guy. #5 on the diagram. (Sorry, I couldn't find any real pictures of the part on Google and my V6 truck is in storage right now.)

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It's definitely nicer than the half ton 350 Y. Still some questionable areas, like where the head pipes combine right before the cat. I ended up replacing mine with Magnaflow part number 23457. Basically the same deal, but with slightly nicer bends and junctions.

 

[Justin S]

The y pipe that I had on my 01 had a nice wide diameter, but also had 2 converters built in.

 

[98sierraslt4x4]

This is the first vortec I have had. I am an LS guy by heart. I have a 2000 cammed trans am with Long tubes off road x 3" pipping tuned out cats and egr so i guess i am just used to seeing some sewer size pipping.

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[98sierraslt4x4]

Tbi LT header conversion install- off road y- remove cats and egr and run all new pipping worth the $$$?

 

[Justin S]

Do it and tell us if there is a difference, and be sure to include dyno sheets of before and after

 

[df2x4]

For science!

EDIT - While you're paying for dyno time, get a before and after with just the Y pipe swapped out. Then we can finally get a conclusion to this thread.