PPP exhaust vs stock
#2
AFAIK PPP for STi consists of a high flow sports cat DP, decat mid section and free flowing BB (although I may be mistaken as the STi may have a decat centre as standard). Not sure about bore, but certainly has improved flow.
#3
The standard back box is certainly not straight through! The Prodrive box is.
I believe only the STi gets the high flow cat. downpipe. (plus decatted centre section) The WRX gets a decatted centre section.
JohnD
I believe only the STi gets the high flow cat. downpipe. (plus decatted centre section) The WRX gets a decatted centre section.
JohnD
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fatboy_coach
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18 June 2016 03:48 PM