srt-4's are okay. for a relatively inexpensive quick car though, they're fantastic. i've raced two of them, beating them both. with just a boost controller and exauast though, i'm sure they could at the very least keep up with me. we've only seen the tip of the iceburg from those cars.
a friend of mine has a shelby dodge daytona. it kicks ass. stock it's already 174hp and 200ft-lbs of torque...and it only weighs about 2650lbs. not bad atall. it's a 2.2 liter turbo engine, and my friends has the boost up a bit, a full exaust, and intake. he can almost keep up with me...but his car is a 1990 i think. just like any factory turbo car, the engine can take a mean beating.