I change the RPM limit from 6,800 (which is stock for most US KL cars) to 8,000 RPM.  This unleashes a much wider power band that you could not experience before with the stock ECU.  With the correct valve springs you can make a lot of power above 7,000 RPM.  You can swap out the ZE valve springs and retainers for DE ones and these will do fine!

Also the air/fuel mixture is raised from 10.5:1 to 12.5:1 for a typical engine in good running shape with good O2 sensors.  The VRIS points are set for the long neck KLZE intake manifold but upon request I can leave them at KLDE points or modify them for the KLG4 intake.

Keep in mind that when you purchase an item from Xtremethings - nearly all of the profits go right back into research and development of new products.  So to help in the efforts -when you purchase an item and become satisfied with it -then please pass on the word.  Your help in spreading the word will be helping with the continued research and development of new products that were currently un-available.

One of the most popular items I have is the Xtremethings chipped ECU for 93-95 2.5L V6 Probe GT and Mazda cars.  These ECU's improve the performance significantly above 4,000 RPMs.  It will also eliminate an Engine Check Light (ECL) cuased by faulty O2 errors or EGR codes.  Also this computer will work with your OEM (KL02) air sensor unlike a JDM KLZE computer that requires a JE50 MAF sensor.  If you are currently running a stock computer you will be impressed with the gains.

The highlighted area above shows how my solder joints  are better than OEM ones nearby.  I do this soldering work myself and I have 23 years of electronics experience so you can be assured that it is done correctly.  All 93 and 94 ECUs are thoroughly tested after modification.  95 ECUs are not tested due to lack of 95 test car but are warrantied to work and if it doesn't -send it back and I will replace it and pay the shipping both ways.  The ECUs are now only $145 plus shipping due to the savings on eBay fees.  Please inquire about shipping costs before sending money.

Current ECU stock:
1 - 93 ZE VRIS Chipped
4 -94 ZE VRIS Chipped

Click the image for a super-sized photo.

Need some high performance turbo fuel rails?  How about some 550cc injectors in rails that bolt directly up with -AN fittings on every end?  I have a large supply of injectors suited for heavy boost applications to make some very serious horsepower.  I have matched sets that have been sent off for professional cleaning, flow testing, coil testing and matched in sets of 6 for our engines.

For a set similar to the set seen to the left with matched injectors, custom modified and powdercoated fuel rails with -AN fittings, rail bore run-out correction and powdercoated hold-down caps I am asking $650.  I will powdercoat them in a color combination of your choice.  This is the ultimate in fuel for your turbo'd monster.

This factory flaw can cause a severe in-balance between the front and rear cylinder banks during high fuel flow demand.  You do not want this if you want maximized power.  Also this can be bad on your engine because of incorrectly balanced fuel/air ratios between banks.

The KL factory fuel rails are bored after casting with a long drill bit.  The drill bit wanders from center as it nears the other end.  To make it look centered on the other end - they stop before the end and then drill from that end to meet the two bores.  This leaves a sometimes severe overlapping section and restriction between the two misaligned bores.  I correct this problem with all of my fuel rails so that both rails will flow equally under high fuel flow demand conditions.

I also can set you up with a set of 850cc matched fuel rails in your choice of color.  Just let me know what you want and I will make it so.  I can either accept direct PayPal payments or I can set up an ebay auction for you if you prefer.

I do custom work such as seen in these throttle bodies.  I can cone the bore, hourglass the butterfly shaft and even polish it if requested.

A coned bore, hourglassed shaft throttle body is $135 plus shipping.  This is $5 cheaper than before because of the savings in eBay listing fees.

I also can build custom Xtreme quality wire harnesses such as the COP harness in the photo above.  Click it for a larger image.  I have many years of experience in wire harness building and so no job is too big for me.  I have built wire harnesses and installed equipment on everything from Cessna 150's to Gulfstream G5's.

This is the latest XtremeThings development.  In cooperation with Nordskog Digital Instruments we are developing a digital instrument panel for the Probe GT.  The speedometer can be fully calibrated to your particular final drive ratio with your tire size to a fair degree of accuracy.  Once calibrated this display can give you your 1/4 mile drag time, 1/8^th mile drag time and top speed in the quarter mile with the press of a button.  The cost for a fully plug-and-play digital cluster will be in the range of $600.  It will be available in amber (shown), red and blue.  Blue will be a bit more because the high quality blue LED segments typically cost more from the LED manufacturers

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