i have a silver 2000 eclipse gt. i am VERY happy with the car. the car is a cruiser, not a "racer" like everything else. it also DOES NOT have to be revved high to get useable power. it has a lot of "go power" right off the line. and as "slow" as it is, people hit high 6s in the 0-60mph and high 14s in the 1/4mile.
the trick is to get rid of the stock "screaming eagle" tires that we have. we have way more power than they canhandle, so we can spin out easily.
aftermarket support: LITTLE, but improving. lowering it 1.3" changes it's character drastically, as the suspension is soft and designer to be more luxorious. a simple CAI will add ~10hp due to the restrictive nature and location of the stock airbox. our exhaust is pretty good, so you should leave that alone. for more info visit 
www.neweclipse.org.