If you're going to run boost on a grand am, your going to need to change lots of the engine internals, such as valves, heads, springs, shafts, stuff like that. the 3.4 in the late model grand ams is relatively easy to mod, but there aren't a whole lots of mods out there for it. Getting "350 horsepower" out of any grand am is going to be damn near close to impossibe without some huge changes. You're going to need to change essentially every aspect of the engine, transmission, and transaxle, and then you're going to need the suspension to take all that power. If you're looking for an easy 350 horsepower out of a GM product, go with some kind of F-body, trans am, camaro, firebird, corvette, or GTO. In order to get that much power out of a grand am, you would have to put a rediculously huge amount of money into it.