i just installed a powerdyne on my basically stock 89. when i first put it on, after about 15 min of testing and running the car, i blew the discharge tube off. it was dark outside and i looked under the car and there was a little oil on the x-pipe and a little on the ground. the motor (306) only has about 5000 miles on it (before the charger). a friend told me i might have preasure building in the block or crank case and should vent the oil cap. just wanted some more opinions. thanks (new to this, but is interesting)