It's the exhaust/airbox that restricts the most.

I'd sort those first before a spend on a manifold that's all I'm saying as you may find you don't need it.

I totally agree about the price of the 185 kit fitted, silly money.

If it's torque you're after then you may want to consider the 4-2-1 manifold as this has more lower and mid range torque than the 4-1 and only a bit less than the 4-1 at 5,000 RPM+.

The clutch can't take much more than 250NM (well not when you're offereing a 3yr warranty) which is why the diesel is only the 90PS in the fiesta instead of the 110PS from the focus.

The Focus has dual mass flywheel