Hi all New to the Subaru world, saved a MY94 WRX from going to a scrappy 2 months ago. Have given it a full service and new brakes all round. Next on the list are gauges to keep an eye on everything, a new spoiler and then look at going a bit quicker.
Is it safe to just up the boost on these? or should I get a remap ? If so I have been told that I will have to change my ECU to do so. Is this correct ?