It would help alot. The problem is where would you get the intercooler? There's no direct bolt in part so you would have to make your own. The a5 jetta also has the correct plumbing for it. You would also have to make your own piping.
A common problem with front mounts,radiator space is an issue here. The other problem, taking away airflow from the radiator, won't be as big an issue. The jetta and especially the passat have plenty of radiator capacity to handle a front mount.
Lastly, while it should help with a chipped car, the money and time is better put towards a turbo and buying premium nozzles. If you already have an upgraded turbo, then I would seriously look at the intercooler. Don't get me wrong, any intercooler upgrade would help, but it's just that IMO, because there's no bolt on kit, spend time upgrading other parts of the power system first.