the standard exhaust is shit ! and I have dynopaper from that.
with same chip however I made that +260hp with same fuel pressure..
and 30hp just replacing the exhaust to 3" . that really tells you something. and also
dynopaper on that too. dont believe every chip seller, what they told. and different dynos also.. remember those are not same.

decat--cat--2 box--box--backbox-- = no power
3"--------------box------backbox--= POWER !


of course its nice if someone gets over 230hp with chip, but still... if you want good power, replace the exhaust or there will be huge backpressure !