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Message: [QUOTE="higherlife, post: 1387374, member: 17544"] I switched back to spar10 tunes because I didn't feel comfortable daily driving yet alone towing with those numbers. EBP being high it's good for the engine. This is what I have found: At increased back pressure levels, the engine has to compress the exhaust gases to a higher pressure which involves additional mechanical work and/or less energy extracted by the exhaust turbine which can affect intake manifold boost pressure. This can lead to an increase in fuel consumption, PM and CO emissions and exhaust temperature. The increased exhaust temperature can result in overheating of exhaust valves and the turbine. An increase in NOx emissions is also possible due to the increase of engine load. [/QUOTE]

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