Mag is about 5-10 hp, invidia around 10 hp and Stillen around 18 hp. Don't remember gains with the berk. You can't just combine the gains with the intake gains though. 18 hp gain with the intake alone for example, won't net you 36 hp with Stillen cat back exhaust. Please refrain from name calling, its unnecessary, makes you look bad and gives people who want to help you a reason not to help you.
There is a lot of information on exhaust gains if you do search.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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