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Welcome to the forum.
Perfomance chips do two things - They help you burn more fuel, and they reduce the life of the engine.
If you want more power/torque, put a supercharger on it.
If you want to save fuel, put 30" HT pizza cutters on it, remove the roof rack, skid plates, and aftermarket bumpers, and keep it below 50mph.

Don't waste your time or money with aftermarket "cold" air intakes (the FJ has an actual cold air intake already as stock) - they just make more noise and more often than not don't filter the air as well as stock, and they have a habit of screwing your MAF sensor up. Also the change in power is negligible, and often loses power, especially down low.

Exhaust - You might gain a couple of BHP at the very top end, but negligible - it will just be noisier, fail emissions tests, use more fuel, etc etc.

Also - The FJ isn't a racecar.

Here Ronny Dahl talks about offroad fuel economy:
- he discusses chips specifically.
 

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