Here are the mods: cold air intake, factory exhaust with deleted resonator (these mods gave 389 rw hp) AND Dynatech headers with 3 inch in/out high flow cats. The headers improved some mid range torque but with the stock heads and cam, didnt increase peak hp. They did increase the raw sound factor significantly.
Im new at this video editing and posting process - so bear with me if this does not work on the first try.
Here it is:
http://www.fototime.com/D2BAB8C20112691/conv.wmv