FEEL FREE TO ADD TO THIS IF I LEFT SOMETHING OUT PEOPLE....PLEASE STICKY... 1. Coils!!!! The lincoln ls eats coils for breakfast lunch and dinner. Even through regular maintenance you might have coils and plugs go bad on you. Symptoms are check engine lights, misfires, dead cats and other problems if not taken care of properly. When changing these you might as well change the valve cover gaskets to prevent oil getting in the wells which probably damaged the coils in the first place. You should also change the spark pluhs while you are at it, and remember to use good quality coils and plus otherwise you will have problems soon after you replace these. Be away that any jerking, stuttering, or shaking can also be symptoms of a vacuum leak or bad pcv on top of the coils. 2. Bushings!!! The lincoln ls over time develops a hallow thud coming from the suspension. Most of the time it will be the sway bar bushings. In some cases it might be the axles, ball joints, control arms and others but check the bushings first as you may get other noises other then just the thud over small bumps. Inspection from a good mechanic or dealer (beware) would eventually find the culprit for the noise. 3. Springs!!!! If you want a big drop or are going to be using 18s or 19s you can go with intrax or springtech springs that offer a 1.75 inch drop. It will be a rougher ride but it will look awesome. If you want 20s and don't want to risk too much rubbing and adding spring stiffeners you might want the eibachs that offer a 1 inch drop. You should be able to use the stock shocks for the car otherwise KYB shocks would be an alternative as there aren't too many choices for the ls. Other factors come in to play with rubbing, like the offset and width of the rim as well as the tire ratio. 4. Shocks!!! The sport, non sport and euros are interchangeable shocks on the ls. Non sport for a soft luxurious ride, sport for a firmer ride, and euros for a stiff sporty ride that may not be for everyone. Kyb makes shocks as well as monroe however everyone who has used monroe shocks would say you might as well get nothing. 5. Exhausts!!! There are numerous setups for the ls with each setup suiting different tastes in owners. For owners seeking a performance setup, the magnaflows offer the most increase in hp which should be between 10-15. The only downside is that they aren't as loud as some would like. SLPs offered 2nd best in performance and are the loudest of the bunch. 3rd are bassani exhaust and are the second loudest. In all honesty, if you have a 2nd gen (2003-up) you are not going to get much of an increase. Flowmasters offer a nice sound as well but may reduce performance. Most people will put in an x pipe in place of the h-pipe that comes on after the cat on the lincoln ls. You may also decide to cut off the resonators and will change the sound although it isn't for everyone. If you are like me, you want 2.5 straight pipe from the cat back or nothing at all. Weld in an xpipe and cut those resonators right off , weld the tips of your choice on and you are good too go. 6. Intakes!!! The intake of choice for the ls is either the K&N intake intended for the thunderbird, or the kkn intake. Both offer pretty good performance and sound. Can either decrease or increase mpg’s as well, depending on how you drive. The most awesome thing about the intake is how it makes the motor sound. Some also fabricate custom intakes for the ls. 7.SCT!! The SCT XCAL is a handy tool that changes performance parameters on the LS by using TUNES to do things like; air/fuel ratio, transmission shift points, default tire size, removing rev limiter. It might not make the LS a 11 sec car, but it definitely improves the car’s performance when coupled with intake/exhaust and some dyno tuning. You can purchase them for under $400 bucks from either Torrie or ILLS(search). 8. Rims!!!! The bolt pattern on the LS is 5 x 108. Any other type of bolt pattern will not fit unless you get some type of adapter or machine the rims to have a 5 x 108 bolt pattern. 9. Hids!!! The LS has about 4 different bulb tytpes. H11 for the low beam 9005 for the high beam H10/9145 for the fogs HID-D2R for the hid headlamps 10. Miscellenous!!! Yes, You can put a 2nd gen lse bumper kit on your 1st gen, but you will have a gap unless you get the right brackets to correctly align the bumper and headlights. The speakers that the ls has are: 6x8 door speakers on all 4 doors and 6x9 speakers on the rear deck. Depending on your specific model, this info may vary.