Description
Factory
Nissan
SR20DET
O2
housing
are
extremely
restrictive,
ISR
Performance
Cast
3"
O2
Housing
are
substantially
larger
allowing
the
exhaust
to
flow
more
efficiently
compared
to
stock
ISR
Performance
Cast
O2
Housing
is
a
true
3"
O2
housing
as
Most
other
O2
housings
are
2.7".
Compatibility
If you have questions about vehicle fitment, please contact us.