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Some Tuners claim to delete the EGR electronically. Does this completely shut down the flow through the EGR like a manual bypass would if you did a delete? Or would it be best to go in and actually do a delete for safety reasons? I have an 08 F250. Thanks
 

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A tuner will not stop flow through the EGR cooler. Only removal or a block-off will do that. The tuner will trick the computer into thinking the lack of EGR flow is ok so it won't throw a code.
 

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Some tuners stop the EGR from opening the exhaust ports. Still allows water to flow, but now it doesn't get as hot.

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