Xtreme EPROM Performance Chip for 1987-1992 BMW E30 325i/iS E34 525i Bosch ECU 173 +22HP

Xtreme EPROM Performance Chip for 1987-1992 BMW E30 325i/iS E34 525i Bosch ECU 173 +22HP
Brand: Sawyer Tuning
Product Code: XT_BMW2
Availability: In Stock
Price: $49.95



Designed for the 1987-1992 BMW 

E30 325i 325iS 325i convertible,  E34 525i 525iS





Custom Chip Tuning



Stage 3 Xtreme Chip - Engineered specifically for Your Vehicle


This chip unleashes more power by re-programming the fuel mixture and timing parameters
of the engine management system. The rev-limit is lifted, giving your vehicle a broader power band. 




Works with ECU code models:
0 261 200 173

 Horsepower Gain:              +22 HP
Torque:                         +19 Lbs/Ft
Raised rev limiter:       7000 RPM
Top speed limiter removed


Requires Premium Octane Fuel (91+)




Compatible with both Manual and Automatic transmissions


Unlock your engine's hidden potential! Typical gains include:

  • Faster Acceleration / 0-60 Times
  • Up to 3+ mpg increase
  • 22+ Horsepower increase
  • Better throttle response
  • Installs in minutes
  • Up to 35% added torque
  • Reduced emissions
  • Better 1/4 mile times
  • Prolongs engine life
  • Smoother idle
  • Better towing power & improved passing ability


Includes everything needed to install

  • 1  Stage 3 Xtreme EPROM Module, Custom programmed for YOUR vehicle
  • 1  Instruction / Install Sheet
  • 1  Antistatic Chip Case






Frequently Asked Questions


Do I need any special tools or automotive knowledge to install?

  • No! the Xtreme Chip  is 100% plug and play.
  • It is tuned for your specific vehicle make and model. 
  • Beware of for cheap $10-50 mega horsepower products. They are fake and are a plastic box with a .10 cent resistor.


Does this product work with automatic and manual transmissions?

  • Yes - Both.

Does this product work with 2WD or 4WD

  • It works on both types if your car has options


Will this product void my warranty?

  • No it will not void your warranty, many dealers frown on performance upgrades. 
  • However, the manufacturer cannot void your warranty for adding aftermarket parts. 

How much horsepower will I gain?

  • Results vary depending on vehicle condition, fuel grade used, etc., but will be around 22+HP.
  • The chip  recalibrates the ignition and fuel based on the variables such as the fuel octane, 
  • ambient air temp and other sensors in addition to driving style.

Can this harm my engine or vehicle electronics?

  • No. Our products have been dyno tested and proven to work with no negative effects on the vehicle. 
  • We guarantee this!


How does this product work?

  • It plugs into your ECU module, replacing the stock chip. The chip modifies signals sent to 
  • your vehicle's ECU computer. It optimizes functions such as ignition timing, air fuel mixture, fuel maps 
  • and produces more power and better gas mileage. The ECU of modern vehicles controls many variables 
  • which ensure the best engine performance. It does this by reading values from a multitude of sensors
  • within the engine bay, interpreting the data using multidimensional performance maps (tables), and adjusting
  • the engine accordingly. It does this in real-time.




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