Nobbie, I've got a 18se sri running a super chips "Icon race". The engine was a bit tired at the time only making 107bhp on the first run after the chip was fitted and the fueling adjusted it made 122bhp. That was also with a K&N 57i and FSE boost valve. Then got a Kent cam, Blydenstein head, rebuilt bottom end went back to the same rolling road and the car made 137bhp. So the chip does work especially as there is no other way to advance the timing on an SE lump. But I would say that a head and cam give the biggest grin. Do the lot you'll love it.