Bought a BA XR6T a few months ago. Went to a tuner to get some mods done to it, he had my car for almost a month. When I get it back he says its over boosting and not to go past 4k rpm, he spent 20+ hours trying to tune it and couldn't work out why it was doing this. Mods done: Siemens 60lb injectors walbro fuel pump HDI GT2 intercooler kit Valve springs XForce full exhaust intake 12 psi actuator So just wondering if anyone has had a similar problem, or has any idea how to stop it over boosting?