Pop along to Mountune - there will be a dealer near you - and see what your son can pick up. Mountune were Ford's preferred tuners for these and you can see a safe 300. But more than that, they mess about with the torque to make it a faster car than a standard 300 bolt on. Mountune performance was warranty backed by Ford. Not that this is a concern today, given the age of the motor. But shows what trust Ford had in using that company to tune the 5 pot up.
If you look on their site, he can see what he can buy and see where the local dealer is, for questions and have a chat to.
When I went to look at my last ST, it was advertised as standard which is what I wanted, but on the test drive I could tell it had been mapped as I'd had one before and this felt the same if not quicker. But because it was such a tidy car I went for it.
Once I'd bought it, I rang Mountune and Superchips but neither had records of the car but both recommended a bigger intercooler just incase it boiled itself...So I put a Radtec Intercooler and Cobra catback no resonated exhaust on it hoping it would now be safe.
Then I gave a Ford dealer a call who had serviced the car on a few occasions, they remembered the car and told me it had a Code Red remap to 265 bhp which was safe on standard equipment!!! (This was very much the same as the current Mountune map) So one exhaust and Intercooler that weren't really needed then
But it did improve performance even more
Always nice to see paperwork for this sort of thing.
According to Neil, his sons car has enough power anyway
But I would always like to know what map it has incase of any issues.
Standard intercooler which can be seen easily behind bumper https://www.google.co.uk/search?q=focus ... ddU7rKATBM
: Any bigger it's upgraded!