What are you trying to do? A mild N/A car doesnt need it. Also a "mechanic" unless he is into the aftermarket performance world, or tuning, wouldnt be who I would ask about this kind of stuff.
My friend's car picked up 19 rwhp with it on an 02 GT with a built motor, Vortech S Trim, no intercooler, of course it picked up with tuning. The big difference was, the car couldnt make a complete 4th gear dyno pass without pulling timing, a full 2-4 or 1-4 gear pull would = massive heat soak and power loss. Now the IAT's actually got cooler as the dyno pull went on with a 50/50 meth/water dual nozzle setup from AIS.