Congrats & Welcome to Forum!!!

It will cost you big $$$$ to get that HP bump you are looking for. This has been discussed at length, do a search it will make for interesting reading. RENNtech, Brabus/Startech are expensive upgrades, best you can do for minimum expense is exhaust , Sprint Booster and a new ECU chip upgrade and maybe gain 10-15 more HP. Purchasing an SRT6 would be more cost effective unless you are a serious wrencher and have a good working knowledge of the MB R170 engine.