1. "Replica" = illegal (not that I care... )
2. "Replica" = no crash testing (pedestrian impact, what happens with parts during the crash, how they brake, etc.)
3. "Replica" = no aerodynamic testing at Vmax (risk of parts flying away due to wrong materials, bad connections, etc.)

Am I exaggerating? Au contraire. "Replica" parts (we actually call the FAKES here) have been involved in many nasty incidents over here in Europe. Especially aerodynamic/body kits, rims and suspension parts.

Guys, if you can afford such a car, you can afford the OEM aerokit too. Or for god's sake, at least get some quality part from a well known Tuner like Techart for example. Do yourself a favor, avoid "replica" parts.