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SN95 Cobras
98 Cobra tune and exhaust leak questions
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<blockquote data-quote="cbrown9064" data-source="post: 14593103" data-attributes="member: 160552"><p>Also, I think there is a slight difference between the 96-98 Cobra and GT mid pipes. Brute force can make a GT mid pipe fit, but they are slightly different.</p><p></p><p>As far as a tune, there is no performance gain by deleting good cats on a stock motor (although it does sound much better). A mod to the EEC is required to prevent the Rear O2 sensors from tripping the Check Engine (MIL) light. The rear O2 sensors are there to check the state of what should be catalyzed exhaust. Without the cats the EEC says "whoa, your cats are not doing their job" and trips the light.</p><p></p><p>So, getting someone with the proper tools (Binary Editor among others) to go in and turn off the rear o2 sensors is what is needed. It is not really a "tune" but is considered one because the programming has been modified. </p><p></p><p>I have no experience with the hand held units (SCT, Diablo, etc...) but think they can modify this setting. I see conflicting advice on this. Binary Editor modifies all settings, but there are a couple ways to get the EEC to use the new data. Fun stuff for sure...</p></blockquote><p></p>
[QUOTE="cbrown9064, post: 14593103, member: 160552"] Also, I think there is a slight difference between the 96-98 Cobra and GT mid pipes. Brute force can make a GT mid pipe fit, but they are slightly different. As far as a tune, there is no performance gain by deleting good cats on a stock motor (although it does sound much better). A mod to the EEC is required to prevent the Rear O2 sensors from tripping the Check Engine (MIL) light. The rear O2 sensors are there to check the state of what should be catalyzed exhaust. Without the cats the EEC says "whoa, your cats are not doing their job" and trips the light. So, getting someone with the proper tools (Binary Editor among others) to go in and turn off the rear o2 sensors is what is needed. It is not really a "tune" but is considered one because the programming has been modified. I have no experience with the hand held units (SCT, Diablo, etc...) but think they can modify this setting. I see conflicting advice on this. Binary Editor modifies all settings, but there are a couple ways to get the EEC to use the new data. Fun stuff for sure... [/QUOTE]
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