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dont buy an ebay chip it just makes your engine managment pump more fuel into the engine. yes it will have more power and torque but it will eventually carbon up your engine if u are not driving flat out everywhere. get it chipped professionaly.
also changing muffler will not change the engine sound or give any more performance but will make the back of your patriot look 100 times better than having an empty beer keg hanging under your bumper. the pat exhaust is nearly straight through give the beer keg a tap it is hollow.
this will cause no problems with back pressure modern cars dont require backpressure in there exhausts. the cat creates that much restriction everything is free flowing after squeezing past the cat....:)
 
21 - 24 of 24 Posts