Pre Cat Gaskets for 5.5 ?
#1
Pre Cat Gaskets for 5.5 ?
Can anyone confirm exactly what gaskets I'll need when replacing my pre-cats with gutted cats?
All of the online parts sites are very unclear about this.
As far as I can tell, it seems that I will need:
1. 20691-8J100 for the top of the rear (firewall) pre cat
1. 20691-30P00 for the bottom of the rear pre cat
1. 20691-51E01 for the bottom of the front pre cat
I don't think there is a gasket for the top of the front cat with the large opening.
Can someone please set me straight on this? I want to make sure I have the correct parts before I start this nightmare.
Thanks
All of the online parts sites are very unclear about this.
As far as I can tell, it seems that I will need:
1. 20691-8J100 for the top of the rear (firewall) pre cat
1. 20691-30P00 for the bottom of the rear pre cat
1. 20691-51E01 for the bottom of the front pre cat
I don't think there is a gasket for the top of the front cat with the large opening.
Can someone please set me straight on this? I want to make sure I have the correct parts before I start this nightmare.
Thanks
#3
#4
I see that the front is much easier than the rear, as in terms of the honeycomb strength. So would be alright to gut the front one, but leave the back? I know someone will say do both, but if the rear is so much stronger, it shouldn't break apart, right?
#5
Nope and nope. They're the same strength, but the front one pops loose and rattles around. A few members have posted that their rears were in pieces (it usually is the front, first, though). Half-assing **** never fixes anything.
Last edited by Child_uv_KoRn; 10-06-2016 at 06:19 PM.
#8
If you would like to make your life easier I have a front pre cat that I could sell you which you can gut off the car. Shoot me a pm if interested
#11
#15
Apparently the blocks are the same from 95-08, so any manifold will bolt up. The Y-pipe is the issue with the Altima headers/Y and the 04-08 headers/Y.
I've read that people have used the 4th gen headers/Y on the 5th gen no problem, and also that people have used the 5th gen headers/Y on the 5.5 gen no problem.
#16
I've been researching this for the past few months, just haven't pulled the trigger yet.
Apparently the blocks are the same from 95-08, so any manifold will bolt up. The Y-pipe is the issue with the Altima headers/Y and the 04-08 headers/Y.
I've read that people have used the 4th gen headers/Y on the 5th gen no problem, and also that people have used the 5th gen headers/Y on the 5.5 gen no problem.
Apparently the blocks are the same from 95-08, so any manifold will bolt up. The Y-pipe is the issue with the Altima headers/Y and the 04-08 headers/Y.
I've read that people have used the 4th gen headers/Y on the 5th gen no problem, and also that people have used the 5th gen headers/Y on the 5.5 gen no problem.
#23
I have the 3 gaskets that the parts catalog shows.
I think there should be a 4th gasket of some sort, that should mount on the large opening of the front pre-cat. I really want to be sure I have everything before I start this.
Can you post a pic of the gaskets you have?
I think there should be a 4th gasket of some sort, that should mount on the large opening of the front pre-cat. I really want to be sure I have everything before I start this.
Can you post a pic of the gaskets you have?
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