2001 911 996 simple horsepower mods

[Larry Herman]

I guess that the biggest question is why?  What is your reason for more power and exactly where in the power band are you looking for improvement.  Answering these questions will help with your decision.

A K & N filter & a lower restriction exhaust will help, but only to the tune of a couple percent.  This will probably make your motor feel more "crisp".  Headers will definately provide more hp, along with custom dyno tuning of your ECU.  You can probably pick up 15 or 20 hp there, but most of it will be upper mid-range to top end power.

It's hard to improve on torque through better breathing.  If that is your goal, think internal motor work, or a 3.6.

Finally, know that hp is a drug, and the improvements that you make now will become the new baseline once you become used to it.  To improve from that will get much more expensive.