Favorite: BBK hi-flow X-pipe (scared a woman at the supermarket once) or sequentials
Least: Dynomax mufflers (they were on my 87 GT for all of about two days before Flows went on in their place)
Best: All that are not least favorites
Least Favorites: Global West control arms, upr clutch adjuster and quadrant, Bullitt Springs, Engine killing crap X-M-P programmed autologic(and I paid for a diablo) chip
Favorite - shocks, struts, springs, CC plates - the whole lowering deal. Also the exhaust- I had the cat-back on there within about 3 months of the car rolling off the floor court. So much better.
Least favorite - probably pedal covers. Install was so awkward. My canned JMS autologic chip is crap.
O I forgot that adjustable clutch cable I installed...worst...mod...ever. I broke about three of em before I went back to a stock for non-adjustable cable. USA ftw!