In my opinion:
Week 1+2: Clenbuterol (Adjust dosage to your liking)
Week 3+4: ECA Stack (25-30mg Ephedrine/200mg Caffeine/Aspirin)
(Cycle these)
Could even add DNP in though its not for everyone, I am a fan and use it responsibly.
Keep in mind these are all dangerous substances and should be researched and used with alot of care.