LS Swap headers

[IMPALA MAN]

Here are some details on the Dynatech Headers. Like any header brand, you must use the correct engine mounts, have the correct engine drive line angle, etc. It plays a huge role in how low the collectors hang, etc.
The link below will help you decide if your combination will work with these headers. As you can see in the link, the flange (at the head) and the bottom of the tubes and collector, do not run parallel, hence the headers are designed for the engine to be at an angle while the collectors run parallel with the sub frame.
These are in the $600.00 range.

FYI
I have seen some transmission combinations that force the customer to either replace the trans tunnel with a raised one, or live with a 5.5 degree engine drive line angle. In these cases the transmission is touching the trans. tunnel and the transmission is as high as it can go. Typically every degree of angle the engine gets tilted, it moves the collectors about 3/8" up or down. If you have an increased drive line angle, you may see low hanging collectors as a result.
These are in the $600.00 range.
Hope this helps.

http://afabcorp.com/Dynatech/lit/Dynatech_LSXCamaro.pdf

Best of Luck with your swap.