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Quicker spool, holding boost longer, thats about all I know, havent realyl heard of any ill effects of one. As far as which one to get, best to talk to your tuner to see what he is comfortable with.
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Joshua
"2007 WRX-20G- Tim Bailey tuned 326 HP 319 ft/lbs
Stage 2 2005 WRX
Cobbtuning.com"
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