do u mean dump/waste pipe or down pipe bro?i think u mean dump/waste pipe.
do it lar.no problem one.the response of ur turbo will be better cos ur separate
the exhaust gas n the gas from ur w/gate.the sound that the dump pipe
produce also music to ur ear(for some ppl).if u really mean by downpipe,it
the exhaust piping after the turbo outlet.u can get a better power n response
by running a bigger diameter there.