Besides showcasing the five custom Lexus models at the Tokyo Auto Salon, The Japanese company has also brought three ‘pumped-up’ Toyota variations based on the iQ, the Prius and the Auris.
The GRMN (Gazoo Racing tuned by MN) iQ Racing Concept is a fitted with a tuned supercharged engine and a roll cage, while at the exterior the car features racing wheels and a massive lower intake.
The Toyota Prius G Sports Concept and Auris GT Concept have also received custom features like new alloys, various body modifications and appropriate side graphics that offer a sportier appearance.  
Toyota press release :
Small in size but big in attitude, a pumped-up, track-ready
interpretation of the super-smart iQ city car leads a posse of tuned and
tweaked Toyota concept and production cars at the Tokyo Auto Salon. The
world’s largest annual aftermarket parts show, taking place (14 to 16
January) gives leading tuning firms and custom car specialists the
chance to demonstrate their engineering and design skills, from mild
sports accoutrements to the wilder fringes of auto design.
The GRMN (Gazoo Racing tuned by MN) iQ Racing Concept is the latest
interpretation of Toyota’s smallest model by its motor sport competition
partner. It’s a stand-out model, with its deep front air dam, huge
lower air intake and racing wheels, but it is not just about looks:
fitted with a tuned- supercharged engine and a roll-cage, it’s cut out
for track action.
It has a strong heritage too: Gazoo’s previous iQ concept car was
given a limited production run in Japan that sold out immediately in
2009.
G Sports (G’s) have also contributed to the Toyota presentation with
Sports Concept version of Prius, with TRD adding an Auris GT Concept. As
well as the cars, Toyota is hosting interactive events at the show,
including forums with engineers and racing drivers and virtual driving
competitions in Metapolis, an on-line community created by Gazoo Racing.

Source: Toyota