anyone...hows es tunings muffler sound??? 98 civic coupe

next...swapped from a d16y8 to a d15b from japan. the motor from japan has dual vtec solenoids(first stage makes the motor run on 16 valves and the second actually controls vtec) so i need to wire the first stage up so that the 4 valves operate at 3500 not 5500 when the d16 vtec engages. cuz their both locking in at 5500 and im losin bottom end power