Review on Innovate Motorsports 3729 Heat Sink Extender by Ryan Garrison

I had two of these on the same 1993 RX-7, with different downpipes and turbo configurations. Both times I've been successful in saving my broadband O2 sensor from frying. On my second downpipe and new TD06 (23rd August 2012) I had a plug welded on about 2ft down and I no longer have a catalytic converter but still managed to get a horrible E-8 on my AFR sensor after a few days receive . This solved the problem again and this time I did not purchase or replace multiple broadband O2 sensors prior to purchasing this extension. with great heat dissipation from copper plates) that Innovate alternately suggests in their manuals. I believe the main reason this extension works is that it gets the sensor out of the direct exhaust stream. My guess is that the direct exhaust and possible burn in the pipe is hurting my oxygen sensors - the extension is taking the brunt instead. The fins have little surface area to dissipate heat, but they are a very tight piece of metal between the exhaust pipe and the sensor. This is likely to increase the delay during which direct heat transfer occurs in the exhaust pipe and can dissipate much of that heat before it reaches the sensor housing. As another reviewer mentioned, a shredder should be chosen. Buy some sealing washers so you don't have to start installing and THEN find out the exhaust plug wasn't welded in your favor - this happened to my first downpipe and another reviewer here. My second downpipe installation went smoothly and matched the supplied copper washer perfectly. 2. This extension allowed my broadband O2 sensors to withstand the sustained high temperatures of the RX-7 exhaust. I have an Innovate XD-16 with an LC-1 and it indicates when the O2 sensor is damaged (no longer accurate) unlike all other fixed broadband controllers. I've been toasting broadband O2 sensors with short bursts, but installing this extender put an immediate end to that. 3. Installed on both downspouts, my AFR readings didn't seem to change. Before installation, when my AFR gauge read E-8, my water temp had a wider spread with less stability, but the engine never ran noticeably worse. So it takes a lot to destroy the O2 sensor and go to sleep, but not very much to affect functionality, albeit minimally. My mileage always went down as soon as E-8 came on, and I only knew that because I write my mileage down on paper. Now I no longer have to do without the turbo to save kilometers and not damage the sensors. If you buy this you will also need to buy a brand new O2 sensor. You wouldn't buy fresh bread for sandwiches and use expired mayonnaise, would you?