BOV sounds from Wangan Midnight R
Now u have Wangan at home

Comes in 3 types
A= KSSHHHH (the most widely used one)
B= STUTUTU (the flutter)
C= THUU (the lower pitched pshh)

Each type has 2 files. 
WMBOV_S1_P the 1-3 level engines, 
WMBOV_S2_P for the later staged engines.