I had Injen SRI with an exhaust (motordyne & Indivia at different times) and then changed to the stillen gen 3 intake and didnt notice any difference. i dyno'd both set ups and they were the same within 5hp.
breather mods in general will give a lil bump up for butt dyno, but you wont notice a big difference between X and Y intake/exuats/cats/test pipes/headers to justify the price.
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