Install with modified kernel?

[jekillen]

Hello:
Is it possible to install FreeBSD ( in this case v6.2 GENERIC RELEASE) 
with a modified kernel?
I am having some network problems with an installation on ASUS N2M32 WS 
pro (AMD64) mb.
I want to try installing without fire wire emulation support, which 
means I have to modify the
kernel to eliminate it. But if I install and then modify the Kernel, it 
will have made its mark.
Please forgive me it this seems like a stupid question. It probably is 
but I just want to be
certain.
Thanks in advance.
Jeff K