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One quick way to test your car's aeromodding potential is to see (after first installing a MPGuino so you can measure your instantanious mileage) how much your mileage improves when you are drafting another vehicle, as that is the mileage you could get if you installed a full set of effectively designed aeromods.
A 4 speed to 5 speed transmission swap would only be worthwhile if the 5 speed resulted in a lower engine RPM in top gear than the 4 speed.
Turf testing is an easy way to see where you have attached and turbulent airflows on your stock vehicle and on your aero mods. It can help you decide where to locate and how to shape your aeromods.
Look at the various sticky lists on this site to get ideas for aeromods and the optimum angles needed. The rest is up to your construction skills and your imagination.
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