The common thread in the NX/SE-R and Neon rejection to FP seems to be the 2.0L engine size. Even the Miata in FP (1.6) starts with 116hp and has to have a LP head IIRC.

To write a good letter - find cars of similar vintage, of similar power AND of similar engine capaicty - the DC2 Integra is close as Greg pointed out but you may just be "that much" over.

The problem with Prod IMHO is that they are forcing newer cars in with limited prep becasue they don't want to create more classes and let older ones die.