Casting number for 318 Exhaust Man.

[TRIPLE-GREEN]

I was looking at my challenger exhaust manifolds and needed to locate a casting number. I am planing on using a TTI exhaust kit and they need it. Where would I look for this number. Is it on the bottom side. Need to jack the car up for that.  Any hints would be great. I feel like a goof I just didn't find it.

Also wanted to know. I cannot afford to replace the stock manifolds for headers. I plan to use a TTI duel exhaust (2.5) as I said. I know by going to duel exhaust I am going to see gains. But how much gain am I loosing out on by using the stock manifolds? Just wondered.

[TRIPLE-GREEN]

No one has an answer for this one? 

[ksierens]

They should be on the side of the manifold, which would make finding it a little hard.  Also, if they are old, the rust may also make it hard to see.

[TRIPLE-GREEN]

Do you mean on the outter Flang edge?

[duodec]

On mine they're on the inside (block side) of the manifolds below the center ports