Assuming you haven't a MEMS 3 a remap wouldn't give you anything on that 143hp VVC engine anyway, unless you tune your engine North of 175bhp or with non appropriate cams.
What you can efficiently do to increase power or torque is:
1- Go for a TF 160 air filter, as that's a closed one and a much bigger one, the original air filter is a clear bottle neck and you can expect 8+ real hp from that alone (with a nice panel filter). Alternative: closed aftermarket air cone filters.
2- Replace the silencer with a free flowing one, MS seems to be a popular choice, probably worth 5+ real hp on your car. You can also replace the exhaust manifold with a longer 4-2-1 but that is quite expensive - it will mainly give you some torque low down though, enjoyable.
3- You can swap the existing exhaust cam for a Piper one and get 5hp. 1+2+3 will bring you into VVC 160 territory. In fact, IF your head is a good one (and that's a variable), 1+2 can already bring you to 160PS and these are bolt on mods. The ECU will adapt with all that anyway.
4- If you have some more money, forget 3 and go for DVA's K06a kit (includes the exhaust cam mod), that is rework of the head etc.
In conjunction with 1 and 2, you will get close to 180hp. Worh reading also Blackoctagon's threads re thermal gaskets.
That's about as far as you can go easily (same capacity etc.) with a VVC as I found out. At 180hp the ECU still copes well but starts to hit its limit, ES Motorsport offers a small ECU retune in that they manage to increase the full throttle fueling somewhat (nice mod IMHO). Some fit also an adjustable FPR at that stage. In the past some (Kumschick) seem to have been able to alter the ECU fueling and rev limiter but revs are best kept where they are or so.
Oh, not a lot to do with power (a few hp if already over 160?), but swap also that horrible plastic TB with a metal one to avoid problems. TB 48 or TB 52. And think about a oil cooling device if doing trackwork (Laminova...). As you can see the ECU is not really the bottleneck on your engine. Having said that, 160hp are plenty in that car and money is then best spent upgrading suspensions, brakes and driver.
I hope this helps
Claude