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After fitting my new elbow back exhaust i have noticed a hesitation from 5k revs onward. Now and again as im accelerating hard its as if the car is restricted by something like it wants to go but cant. I can hear spluttering from the exhaust usually followed by pops and bangs and i have also seen mahoosive orange flames rise above my boot. Is this to be expected or is it time for some new plugs?