This is the Traxxas 2.5R Racing Engine with IPS
(Integrated Pilot Shaft) and Pull-Start.
For use in all Traxxas vehicles that use the TRX 2.5 engine.

Features:
Slide carburetor provides less restrictive, straight through airflow
for more power and better throttle response.
PowerTune head is machined from aluminum which promotes even heat
distrubution for stable engine temperatures and rock-solid tuning
New sleeve for improved engine efficiency and better power.
Molded head protector prevents damage to the head and secures the
glow plug wire.
Ultra-low restriction air filter provides superior air flow and
filtration for more power and a long engine life.
Offset wrist pin further reduces piston slide loading for more
even cylinder wear and longer engine life.

Includes

One 2.5 (0.15cu in) Engine with Pull Starter w/flywheel nut
One 90 degree air filter (includes base for upright mounting)
One 22 chapter Engine Set-up DVD
One Owners manual/instruction booklet
One bottle of air filter oil
One Decal sheet
One pre-installed glow plug