I'll get started using my old 1998 Mustang V6. I don't have it anymore, but it's a good baseline for new members and others to follow.
Engine
Ebay Cold Air Intake w/ K&N Filter
56mm BBK Throttle Body
Ported/Polished Upper Intake Only
ASP 24% Reduction Underdrive Pullies
Ignition
Red 9mm Spark Plug Wires
Tuning
Diablo Predator Tuner (custom tuned)
Exhaust
94-98 V6 Off Road X Pipe
Steeda MIL Eliminators
Magnaflow GT Cat Backs 94-98
Drivetrain
3.73 Motive Gears
Motive Bearing Kit
23 Tooth Speedo Corrector Gear
Ford Racing T-Lok Limited Slip Differential for 7.5" Rear Ends
Exterior
14" Steeda Shortie Antenna
17" Saleen Replica Chrome Rims
Audio
Sony X-Plod Stereo
4 5" X 7" Boston Acoustic Speakers
Sealed Dual Sub Box
2 10" JL Audio W2 Subs
1200 W Sony Pro Series 2 Channel Amp
8 Gauge Power Amp PowerCable
Pros - The Magnaflow Exhaust sounded awesome. When I had the car on the dyno, the sound was extremely impressive, so impressive the shop owner said that's got to be the best exhaust he's ever heard on a sixer. Nice and deep and mellow down low, but fairly loud up top with little sound loss, in other words, you don't get as much of that V6 sound in their exhaust as other brands tend to get. The Diablo tune also drastically improvedmy automattic transmission. It only made 5 rwhp on the dyno, but the gains by the tranny made it so worth the cost. My custom tuning also helped out a lot as well. Boston Acoustic speakers were also a nice addition, just wish I had a better stereo at the time.
Cons - The ebay CAI was one of my biggest mistakes I made with that car. It wasn't one of the $25 cheapies, but it wasn't name brand either. There were no fitting issues, but the chrome faded on the CAI after 2 or so months, and within a year the blue hoses begain to dry rot, and the chrome hose clamps started to fade as well as corrode. Another don't was my Sony stereo. While Sony makes great stuff, their stereo equipment is crap. My amp is OK, but that stereo was crap. I did like how you could do a lot of in depth tuning, but the power wattage was so low, I had to drastically turn down my power on my subs just so I could hear my speakers. Also, while the 14" shortie antenna looked nice, it was just not practical if you live over 30 miles away from the broadcast tower, because my signal was cut in half, along with the height, like I said, looks great, but should really only be used for show if you live away from the city.
Suggestions -In my 5.0 I have an Clarion flip out stereo, which allows for decent tuning, but the amp inside the Clarion is much more powerful than others I've heard. If you're running subs, you could still use a separate amp to power the speakers, but the built in amp the Clarion has is still pretty good. I now run a BBK CAI in my 5.p, which is light years above my old ebay CAI in my sixer, 3 years old and still looks good as new.
