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Its an e-7 427. But it doesn't seem to make anywhere near that much power. I used to drive an older e-7 427 without the emissions garbage on it and it would climb hills way better and the fan didn't kick on half as much. 

Have you ever seen an EGR delete on youtube? it looks pretty easy to do if you can turn your own wrenches. It looks like they just cut a piece of steel and drill some holes so it will fit where the egr matches up to the recirculation pipe and the exhaust bypasses it and leaves out the exhaust. Your only issue would be if the truck would throw a code cause it detects no flow. Also i read that engine fan can rob an engine of 30 hp. theres a Mack facebook page Volvo & mack truck enthusiast they usually are very helpful and can almost certainly provide you an answer

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