In
1994,
HKS
introduced
the
first
Sequential
Blow-Off
Valve
that
blazed
the
auto
industry
with
a
unique
pull-type
sequential
valve
structure
and
a
differential
pressure
control
system.
This
advanced
system
allowed
for
a
broad
operation
range
from
low
to
high
boost.
This
pull-type
relief
design
ensures
stable
operation
regardless
of
boost
pressure.
Super
SQV
4
features
include
a
nickel-plated,
die-cast
metal
secondary
valve,
which
is
swaged
to
the
primary
valve,
a
stainless
steel
C-Clip
and
spring
to
increase
sealing
and
durability.
To
assure
buyers
that
they
are
purchasing
an
authentic
HKS
product,
the
new
design
incorporates
a
holographic
HKS
logo
on
the
back
of
the
valve,
as
well
as
additional
HKS
logos
cast
onto
the
body
structure.
The
Super
SQV
4
utilizes
the
same
mounting
flanges
as
all
previous
generation
SSQV's
to
assure
compatibility
with
all
optional
HKS
SSQV
inserts,
recirculation
fittings
and
recirculation
kits.