looking for some help from some L67 pros
ok so first with a little background, 99 2dr gtp 102k miles stock with intake it went 14.39@97.4
now after speed daddy headers(no cat)and 3.5 pulley and tune it is no faster. using the same tune as all my friends have on there gtps. mine is just as fast as theres but i went 14.3 stock when they went 14.9@94 stock now we all run 14.0 makes no sense
so far ive swapped icm with no difference and put new front o2 sensor in.... i do have some small exhaust leaks but no enough to tick or anything at idle. leaves at crossover pipe and at dp with it meets catback
car knocks anywhere from 2-4.5 on a 2nd gear pull and LTFT's are -1.5 they are 9-10 at idle which seems high
thanks for any help
