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Hi,

I successfully did the airbox mod, and I was wondering if there are any other freebie mods that members can share?
 

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EGR reroute is certainly one of the best, (basically) free mods you can do. Keep that nasty crap out of the intake!!
This ^

I wish I had done the mod, but when one of my catalytic converters fell apart, it came through the EGR and destroyed my engine at around 140,000 miles.

Also, the water pump tensioner bypass is a good idea, if you have it on your car.
 

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Off the top of my head...

Some of the free mods not mentioned yet:
- 3rd brake light mod
- door guard removal
- Stretching the coil in coil packs

Cheap mods:
- TB grounding
- Stubby antenna
 
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This ^

I wish I had done the mod, but when one of my catalytic converters fell apart, it came through the EGR and destroyed my engine at around 140,000 miles.

Also, the water pump tensioner bypass is a good idea, if you have it on your car.
How do you know it came through EGR only? The exhaust ports are open during exhaust cycle when the unburnt fuel gets dumped on catalytic converter and explodes. The broken/molten ceramic will be forced into the engine through much bigger exhaust ports first.
 
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