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Anyone using magnus intake manifold gasket?

12K views 27 replies 13 participants last post by  garychios  
#1 ·
I just purchased the magnus heat barrier intake manifold gasket for my 2nd gen gst. Its made of a hard plastic. I have heard that people are having trouble with them leaking. Some say that they use a stock gasket on the head then the magnus gasket, some said they just used the magnus gasket and some said they used a OEM gasket/magnus gasket/then another OEM gasket. Some have used RVT sealant with it. How is this thing supposed to be installed? Do I just use the heat barrier gasket by itself?
 
#7 ·
Plastic never melted on mine, 1g though I'm using a 1g head on 6bolt, mine was from SBR but is the same thing as the magnus one.

I used blue rtv on both sides of the gasket when I installed it. Works perfectly and keeps the I/M cool enough to touch.

I know asmo is using one too but am not sure if he did anything differently.

A fellow I was helping sandwiched the magnus heat spacer between two I/M gaskets , that was unnessary, blue rtv was enough for me.
 
#6 ·
#8 ·
I used one for a 2G head, and was not impressed.

The thin area deformed badly causing pressure leakage. And the area around the EGR port completely melted and blew out from using antilag a couple times. I'm back to using the steel OEM gasket without issues.
Thats what I was afraid of. I would hate to put it on just to have to take it off again.
 
#10 ·
I tried two different heat barrier gaskets too. The first one was deformed so badly when I removed it for the first time, I decided to replace it. And after removing the second one due to blowing out around the EGR port, I noticed it was badly deformed around the runners just like the first one. It's just too soft for it's thickness. So, I decided it was best to give up on using them, and to just go back to the tried and true OEM gasket.
 
#16 ·
I know it's old, but no sense in starting another for the same thing. I too think I had a fail..... I think mine might be EGR. I am thinking the difference is SMIM or stock.... I have SMIM and that means the EGR Port can go no where but the plastic, therfore warping it, making it leak...... If you have a stock mani the heat can at least go into the mani a lil, blocked or not.
 
#21 ·
Hmm good to here because I just bought one. :) I was thinking about doing what asmo said and sandwich it between two oem gaskets. I don't really want to do that though I think I'm just going to use some rtv on it and throw it in there. If it leaks I'll blow up the car. :D

I'm going to just unbolt my throttle body and set it back there that way I don't have to take those damn coolant lines off. Hoping to have it on Thursday so I'll report back with a boost leak test.
 
#22 ·
Reporting in with successful heat barrier gasket. I've got an ebay one, which is much thinner, and a Cyclone IM which has no EGR port at all, and so far no warping or ill effects. :) I love this gasket, I swear. I could make 50 pulls all at over 20lbs of boost in 96 degree weather with a heat index of over 104-107 degrees, and the gasket works so well I literally can(and have) lean on it, without even an inch of mild discomfort. This gasket rocks. If I ever..ever swap out my 1G head for my 2G head I have laying around, you best believe I'm going to purchase another one.
 
#26 ·
There are mixed reviews out there about it failing. I just want to hear from people with first hand experience. I have one I'm about to install and I want to make sure it seals right.
 
#27 ·
A piece of plastic that thick (Even crushed) will still move around when it gets heated. Then when it cools you wont seal properly because it will deform. Hence boost leaks.

The best bet is to use for drag racing only and monitor after every race. Another thing (What I did) is to make a 2" thick phenolic spacer on a Machine. Its like wood. This thing wont deform and holds a ton of boost. I did it to my car. Keeps the intake temp alot cooler than the block.