Well, looking at fastest FF's, if we're going to be using the same car for all 3 events... in order of best weight to power first: (not considering hp over 394)
323 4Door Sedan '89, 370 hp at 2028 lbs
206 S16, 372 hp at 2189 lbs
Integra Type R 98 Spec, 370 hp at 2189 lbs
Focus Ghia 2.0i Zetec, 388 hp at 2352 lbs
Integra Type R Spoon, 312 hp at 1825 lbs
Integra Type R Mugen, 358 hp at 2189 lbs
156 2.5 V6 24V turbo tuned, 463 hp at 2587 lbs
Coupe 2.0 200 Turbo, 391 hp at 2568 lbs
Golf IV GTI 1.8T, 384 hp at 2506 lbs
Eclipse GS-T, 400 hp at 2607 lbs
Civic Type R Mugen, 339 hp at 2149 lbs
Civic Type R '98, 336 hp at 2129 lbs
156 2.5 V6 24V NA tuned, 387 hp at 2587 lbs
Integra Type R '95, 362 hp at 2385 lbs
New Beetle GLS 2.0L, 370 hp at 2462 lbs
Demio A-Spec '97, 270 hp at 1662 lbs
GTV 3.0 V6 24V, 410 hp at 2775 lbs
A3 1.8T 20V '96, 343 hp at 2321 lbs
Civic Vti '93, 293 hp at 1926 lbs
156 2.0 TS 16V, 351 hp at 2451 lbs
Civic Vti '98, 326 hp at 2230 lbs
Stratus ES, 371 hp at 2673 lbs
166 3.0 V6 24V, 410 hp at 2960 lbs
Golf IV 2.3 I5, 349 hp at 2517 lbs
Golf IV V6, 349 hp at 2517 lbs
Civic Type R '97, 306 hp at 2129 lbs
166 2.5 V6 24V, 384 hp at 2923 lbs
Civic Vti '95, 299 hp at 2072 lbs
Laguna V6, 380 hp at 2883 lbs
Civic Type R Spoon, 250 hp at 1662 lbs
Prelude SiR-S Spec '98, 342 hp at 2491 lbs
FTO GPX '94, 328 hp at 2372 lbs
145 2.0 Cloverleaf, 335 hp at 2453 lbs
FTO GP Version R '97, 322 hp at 2332 lbs
FTO GPX '97, 322 hp at 2372 lbs
Try to pick something towards the top of the list, if you want to be competitive in all 3 events... if you want to focus on the first event or two and basically forfeit the last event, you may have some more options... or some of the cars towards the bottom of this list might work for you.