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327 Posts
Please your advise and help, i still have the standard exhaust system fitted to mt ST3 and thinking of changing the cat to a Dream Science Sports-cat or keeping the standard cat and change the turbo downpipe to a Dream Science Turbo Down pipe. i am keeping the standard exhaust form the cat back and have no intention of changing this. What i want to know is which one i should change, Sports-cat or Turbo Down pipe? Which one will give me the greater performance? also will changing one of these make the exhaust louder and pop more if so which one. Very undecided in which way to go and want as much feadback from you all as possible, but remeber im keeping the standard exhaust system and only wanting to change either the Sports-cat or Turbo Down pipe