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well if the fan was powerfull enough then yes it could have a big effect on the performance but I doubt that a fan that large could be fit in a even 3" pipe. I say it would have an effect on the performance because any book you read on testing EGR's say not to have the vehicle hooked up to a vacume type exhaust evacuation system because it pulls the exhaust gas out faster than the EGR can take it. shure you could get yourself a high watt 12v inverter and 2 thrift store canister vacumes and then jam the ends in the tail pipes, and I'm shure you would see some sort of a diffrence but the extra drag on the alt might not make it so much. would be 1 heck of a contraption and a conversation peice for anyone who saw it.
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