I am thinking of havng a Unitronic Chip installed in my 2005 4.2. Anyone have any experience or knowledge regarding these chips? Unitronic claims that it increases the output to 355hp/329lb-ft, which is an additional 20 on each over stock. There are two authorized dealers on Long Island, Tyrolsport and Force Fed Engineering. I have heard good things about Tyrolsport, but Force fed Engineering is closer. Any experience with either of these two shops? Thanks.