So, I MIGHT be getting a GS300 next year, i was wondering what could i put in the engine to upgrade it? like 40HP or so, or maybe 70HP....

 

Headers / Catback exhaust - Intake

 

there is a HUGE wealth of knowledge for the info your seeking here at CL.. check out the search function right in this forum- top left of the screen there... also check out the forced induction/exhaust/trans forums, etc.

 

best bang for the buck.............nitrous...... but be carfull its addictive.........so when you start going through 3 or 4 bottles a week thats when you know you got a problem