Ford Focus Forum, Ford Focus ST Forum - View Single Post - Exhaust Piping Size
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Old 02-16-2013, 12:32 PM   #7
FocusBoy58
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Duratecs make the best power on 2.5" to 3" Maximum exhaust size. I went from 2.5" to 3" header back and bumped me up from 176 to 183whp, tq only increased very slightly but the torque was still a table top 140-157wtq from 2500 and up.

If you are going to spend the money get a 2.5" system period. trust me.
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2012 Audi Q7 TDI S Line ABTuning 391whp588wtq
01 Turbo Focus 300+ whp
2012 Focus 19" Niches, AEM CAI, F2 Race Header, 3" Borla Dual Exit, H&Rs, Eibach Sways 183whp157wtq
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