Quote:
Originally Posted by 2k14frs
Was doing some research, and somebody said on another forum that a uel header was causing his ecu to malfunction because of different pressure from the pistons. I don't know much about cars, but more than willing to learn. Anybody know if this will be a problem if I purchase a uel header? Or what's better to run, El header or uel header?
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If they are both well designed headers their will be little difference in performance.
EL generally produce slightly more top end power
UEL generally produce slightly better midrange
only a few hp in it
Just pick the sound you like UEL for clasic subbie rumble .
Stock header has catylitic converter, if you put on catless headers either uel or el it will likey throw a cel code due missing cat. Catted headers either type should not throw cel code . You can get a O2 sensor spacer to hopefully stop the cel code.
To get max benifit from either type of header you need a tune, you might only get 5 hp gain without a tune but 15 hp with tune and better midrange and no cel code as tune will disable the cat efficiency cel code