Here are some more transformers only Decepticons.
DECEPTICONS
Megatron as a Cybertronian starship and an Abrams M1A1 Tank
Soundwave as a Eurocopter EC135 Helicopter and Aston Martin DBS V12
Shockwave as a Cybertronian tank and a Lockheed Martin F-117 Nighthawk
Skywarp as a Lockheed Martin F-35 Lightning II
Starscream as a Lockheed Martin F-35 Lightning II
Thundercracker as a Lockheed Martin F-35 Lightning II
Reflector as a Lotus Exige Sport 380