ride around for a week without them and see how you feel. If you need to add one...then add one. One at a time. Its all about what makes you feel good. Very few people actually care about them, My personal opinion is that they do not detract from the car.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg