Went for a bit of a fang today with a couple of mates who when we parked up kindly informed me that when I hit boosty boost it's like a smoke grenades been thrown behind my car. I think this is because I never really use my secondary (living in Chch and just commuting to work everyday) and it's just blowing all the crap out. Other possibility is I need new plugs? And the other "problem" I've noticed was at 4800rpm the car shudders abit, almost like it's not getting enough gas? Any advice, ideas, help appreciated