Added an inline exhaust break to my 4" exhaust.

Turned it on to discover a leak at the clamp between the turbo and exhaust.
I'm looking to add a rubber gasket of some kind.

There is no reason the proper setup should leak unless something is wrong. What motor, application, exhaust brake are you running? Rubber will never stand up to the long term high EGTs it is going to see, ESPECIALLY being right at the turbo.

F250 7.3, 4" magnaflow, pacbrake

My Jacobs brake came with a special gasket to install between the turbo and the exhaust brake elbow. I would suspect that pacbrake would do something similar. My gasket is a metal material that crushes on install.

Since its an inline exhaust brake, I'll assume its down on the frame rail. What kind of flanges are on the exhaust brake, what kind of clamps is the system using? For the cost of a Pacbrake, Im sure its not just a slip on, u-bolt style exhaust clamp. Anyway you could post a pic? Or even easier, call Pacbrake and ask if anything is supposed to go where the leak is.

The clamp at the downpipe is known at times to have issues. Check out powerstroke.org or thedieselstop.com for fixes. It sounds like from your description this is where you are having problems. You may need to buy a new clamp. There is no gasket at the downpipe/turbo.

The brake is not on the turbo, it is about 3 ft down the exhaust.

I'll try adjusting it and then I'm just gonna get a new clamp if that doesn't work.

Find a local turbo shop and get a crush ring. Their generally steel then a new clamp.

"Turned it on to discover a leak at the clamp between the turbo and exhaust."

I know the brake isn't on the turbo....

Your explanation implied (to me) that the leak was farther upstream at the downpipe/turbo connection.

It is. I was responding to another poster.

Its a v-clamp right? make sure the clamp is tight and make sure the mating surfaces are not rusty and are flat. You might need a new clamp because the clamping portion becomes streched out and doesnt provide any inward force to the pipes anymore. I have taken a vise-grip to the clamp to close the v up a little for more clamping force.

I'm just replacing it. Don't have time to screw with it.

I'm just replacing it. Don't have time to screw with it.

I'm having the same problem... dealer wants $85 for the clamp, I'm not excited about that unless I'm positive it'll fix the leak.