Hello,

I bought a mk1 Focus RS today.

It has a boost problem. It appears to be laggy and when it does boost it peaks at 15psi and then the boost drops back off around 5000rpm until it is back to 0psi.

Mods are:

Bluefin
Tubular Manifold
Full Exhaust
K&N Filter

It has had a recent turbo and actuator.

Any suggestions or common problems?

I am going to check for obvious things that could cause a boost leak etc.

Thanks,
Stephen