Honestly, I'd probably keep it and leave it as is. At most maybe add some details to the interior and add better brakes.
*EDIT*
A little summary of all the 1/18 models I got this year...
37 1/18's, which beats my previous record of I think 24, by a long shot. A mix of old releases and new releases, as I decided to grab a few older models before prices shoot up.This year also saw a huge jump in the amount of resins I own, thanks to GT Spirit and Otto deciding to make a ton of cars no one had the balls to make in 1/18 before. Of those 37 1/18's, 18 of which were resin, 17 opening diecast, 1 opening plastic, and 1 sealed diecast. Ok, enough talk, how about a list of my 1/18's I bought this year:
TSM:
McLaren F1 LM (Orange)
Otto:
BMW 850CSi (Red)
Opel Lotus Omega (Dark Green)
Mercedes Benz E500 Limited (Silver)
GT Spirit:
Porsche 930 Turbo Slant Nose (Red)
Porsche 964 RWB (Red)
Porsche 964 RSR Martini (#909)
Porsche 993 Turbo (Grey)
Porsche 993 GT2 Evo (White)
Porsche 997 Speedster (Blue)
Porsche 997 Sport Classic (Grey)
BMW F80 M3 (Blue)
Lotus Exige S1 (Orange)
Ruf CTR2 (Silver)
AUTOart:
Bugatti EB110GT (Red)
Nissan Skyline GT-R KPGC10 Tuned (Black)
Alfa Romeo 4C (Red)
Alfa Romeo 33 Stradale (Red)
Mazda RX-7 Spirit R FD3S (Blue)
Lamborghini Gallardo LP560 (Orange)
Jaguar XKR (Black)
Subaru Impreza 22B STi (Blue)
Hot Wheels Elite:
Ferrari LaFerrari (Yellow)
Ferrari F355 Berlinetta (Red)
Ferrari 348TS (Red)
BBR Top Marques:
Jeep Grand Cherokee SRT-8 (Red)
Maisto:
Ford GT90 Concept (White)
Bburago:
Dodge Viper RT/10 (Red)
Spark:
Mazda MX-R01 Le Mans 1992 (#6)
TWR-Porsche WSC-95 Le Mans 1996 (#7)
Lancia LC2 Spa 1985 (#5)
HPI:
Porsche 962 Le Mans 1988 (#18)
Alfa Romeo 155 V6 Ti DTM 1993 (#8)
UT Models:
BMW E36 M3 GTR (White)
Norev:
GT By Citroen Concept (Red)
BMW M1 (White)
GMP:
Ferrari 312PB (Black)
As for a favorite of all of those... hard to say. I t would probably have to be 4 way tie between the TSM F1 LM, AUTOart KPGC10, GMP 312PB, and AUTOart EB110. Honorable mentions include the Spark Lancia LC2, AUTOart Alfa 33 Stradale, GTS F80 M3, GTS 964 RWB, and GTS 993 GT2 Evo. Might make another post for my 1/43 exploits later, after my final 1/43 of 2015 arrives. Anyway a pic of the 1/18 madness: