tukn18saccord
+1y
no do not close your lower ports you will blow the rings out or expand the can, i dont know what to say about your car bouncing, ive had cylinders for years on 2 diffrent civic and mine has never bounced like that, i usually hit my switch 2 times and mine rides smooth, but one thing you can do is accumilators for the front and rear that will help alot, lets your air expand for a much better ride, as far as your lower port take out what ever you got restricting the air flow out and use air muffles or silencers so the pressure can get out of the cylinder hope this was some help