Fwiw, I hit 308whp 255wtq with just berk exhaust and g3 after tune at specialty z. You should get over 300 but there is no guarantee how "your" car will react to the mods.
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2010 PW 370 base+sport 6mt
Stillen g3's/ Berk CBE / Stillen 19 row/ uprev: 308whp 255wtq dyno jet @ specialty z.
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