S&P Motorsports - many, many upgrades for Probes including sway bars, clutches, & brake upgrades
Lo-Tek Gaugepods - full a-pillar replacement gauge pods for 2nd generation Probes
Mazdaspeed - complete J-Spec engines, camshafts, & high compression pistons
RR Probe Racing - big brake kits, polyurothane motormount inserts, ect.
Asylums.com - body kits, carbon-fiber hoods, & Z3 fenders for '93 to '97 Probes
Hotshot Performance - full cold air intakes and the best headers on the market
Interprep Tuning - ported heads, cams, ect.
Driveshaft Shop - performance axles & cv-joints for 2nd generation Probe/MX6s
Scooter's Auto - any oem part for any Probe
The Ford Probe & Mazda MX6 Bulletin Board
Justin's Ford Probe Project
Michael Fortier's 400hp Super Probe
Ross' Probe GT Performance Page
Brian's Probe GT Performance Page
Turbo Probe GT
A Custom Turbo Probe GT
Probeology
Tommy's Ford Probe GT Online