DIY Threads for Modifications and Repairs
There are many well detailed DIY threads on
GasSavers.org containing great writeups and discussions of modifications and repairs. This posting is just one member's collection, and is not exhaustive of this site's content. By all means, search the forums for more DIYs.
The content in the linked threads reflect the experiences of members who were kind enough to share them (thanks, and kudos

). As always, your mileage may vary.
I'll add more threads from time to time. You too can point me to ones you think fit the theme of helpful DIY articles I should reference.
AerodynamicsAerodynamics - Front
Aerodynamics - General
Aerodynamics - Rear
Aerodynamics - Underbelly
Aerodynamics - Wheels
Brakes
Driveline
ElectricalElectrical - LEDs
Electrical - Engine & Accessory Control
Electrical - Audio
Electrical - General
EngineEngine - Add-Ons
Engine - Fixes / Maintenance
Engine - Miscellaneous
Engine - Swaps
Instrumentation
Instrumentation - Fixes to OEM
Instrumentation - Adding FE Computers
Instrumentation - Add-Ons
Instrumentation - Miscellaneous
Mechanical
Suspension
Tools
Trim
Member Experiments and Larger ProjectsMember Experiments
Member Projects
Bonus ContentDIY Idea Proposals
Other Great stuff at GasSavers.org