help

i got my manifold put on and a full pwrflow exhaust with out a cat. i only get like 30miles to £10 is this right!! if i put the cat back on will make it better.any tips??? i should have just put a turbo init.lol :roll: :eek:
 
holy crap 30 to a tenner! totally nailing it i can still get 40/50 miles to a tenner

what engine aswell?
 
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