Yes, it replaces every *.val-file inside the ...data\submarine-folder...so I guess the 2 are incompatible.
You can get his mod (-s) here, if you want to take a look yourself:
http://hosted.filefront.com/aragorn155/
Here's a SubSim topic:
http://www.subsim.com/radioroom/show...akes+Nvdrifter
But on a side-note: what exactly would be broken in your exhaust-mod, if I overwrite it with Nvdrifter's longer wake?
Just your own longer stern-wake, or the entire exhaust mod?