There are many mods that you can use but I definitely recommend the following:
U-boat Dynamics v1.1 for SH4 OM http://www.subsim.com/radioroom/showthread.php?t=207791
Real Clothes (V2.0) http://silenthunter.filefront.com/fi...Clothes;110383
DBSM_SH4
German Map Labels
OM Deutsch Om-Omegu
TheDarkWraith_Ship_Plane_Fire_Damage_v1_4_SH3
TheDarkWraith_DC_Water_Disturbance_v2_0_SH4
I would also like to point you to Fubars sub skins, repackaged by me
http://www.subsim.com/radioroom/showthread.php?t=167404