I recently bought a 93 cutlass supreme with the 3.4 and am looking to add some power to it. There isnt much in the way of simple add on instant horsepower parts for this car. The best site to go to is
http://www.angelfire.com/ca2/34Performance/ , lots of articles and what not about the 3.4 engine and how to make it faster. The first thing I am doing is putting an Akimoto Spiral Flex intake w/ cone filter to make a short ram air setup
http://www.racingsportsakimoto.com/. You can also put a performance chip or add dual exhaust.