Its a Supersprint tubular exhaust manifold and down pipe 4in2in1.
Which is necessitated by the 2.1litre engine with flowed & ported head
You don't need to run a tubular manifold on a 2.1...ported head or otherwise.
2.1s make torque, not revs...so unless you are going full race, solid lifters and bigger valves ALONG with big cams, and going to 8000+ RPM, you can manage just fine on a standard set of downpipes and a ported exhaust manifold.
If you run that manifold you have you will have to run near solid engine mounts unless you fit some form of flexy joint.