Need some insight

[Bruha]

Hey guys, long story short. Real short. I bought a new magnaflow x pipe last year and can not get it sealed at the stock manifolds. The passenger side keeps blowing out. I have reinstalled three times but the felpro gasket continues to blow out!

I finally got magnaflow to replace the x pipe under warranty. They have great CS and that is the only bight spot as of now. I have had mustangs for most of my life and usually do most of my own work, but this is driving my nuts!

I have the new pipe, and new gasket, and even might try a little Locktite 5920 on the set up.

Here's my main question. Do you think the factory manifold could be the issue. When I took the mid pipe that came with the car off I noticed the previous owner had used some gasket making material.

Any insight would be great. Anybody else ever have an issue like this?

 

[cobra4168]

^ Had the same problem myself with stock manifolds. I used high-temp rtv sealer on both sides of the gasket a couple months ago and so far so good. Someone here may have a better solution. I wouldnt put locktight on the flange nuts.

 

[Bruha]

Agreed. It is a Locktight form a gasket for high temp exhaust situations.

 

[05satinGT]

This is the legendary spot where they always leak. When I had my stock manifolds and I put my O/RX on, I bought the new gasket and prayed for the best. Surprisingly it never leaked. I never dealt with a magnaflow x pipe but maybe the original one that you got was a little off and the new one will be better?

 

[Bruha]

Nice rolling shot satin!

 

[Bruha]

The tiny spot welds on the gasket are what comes apart. Or maybe the fact I am running a little xtra boost! haha

 

[05satinGT]

Nice rolling shot satin!

Thanks man :beer: shout out to Mooch for taking the pics.

What mods are you running? Get some headers and call it a day lol

 

[Bruha]

I am running a Whip 2.3@ 19 lbs with all supporting mods. CAI, exhaust, fuel, blah blah blah.

I want headers, but just not ready to take the plunge. I want to go coil overs at same time if I do that.

 

[roy_1031]

I had a leak there and to fix it I just put a jam nut behind it and tightened it down and it hasn't came apart since.

 

[Bruha]

So is the problem that the nut backs off, or the gasket is junk??

 

[jrgoffin]

So is the problem that the nut backs off, or the gasket is junk??

The factory metal gasket isn't junk, it seals quite well actually. Maybe that's the route you need to take instead of using the FelPro gasket?

 

[SVTwhore]

Aren't the MagnaFlow X-pipes a one piece unit? Maybe the pipe needs a little twist to seat properly...? I would like a one piece but feared of fitment quirks and opted for a modular unit.

 

[Bruha]

I believe I have figured this out possibly. Not sure all aftermarket mid pipes are the same, but the magnaflow has a stub or riser piece on the passenger side. It is welded inside the flange. The factory manifold has a reverse recessed area and they mate together. I hope I described that well enough.

Anyways, that stub is too long and it is bottoming out on the manifold before the gasket has a chance to seal. I will take some pics so you guys can understand what I am saying.

So now either I trim it down, or wait on a new pipe. Problem is I already spent 60 bucks on this one for AF bosses to be welded in.