Get this bolted on with supporting mods and start to make serious power and the pistons and rings will bed in http://pages.ebay.com/link/?nav=item.view&id=130988998626
Have you thought about using a bigger turbo and running more boost which will surely cause the engine to run hotter plus you will have alot more power. Just your current setup is good its just not stressing the engine.
I have 4 head units sitting in my room and like 5 in the garage im wanting to add a aux to the old headunit so it looks standard but will play my ipod.