all depends dude. Different day different dyno. What u really wanna look at is the 2 values ( dyno readings) of before and after to see what sort of gains u get from your mods.
Well, the header was cut right after the collector, cat welded in and then the end of the test pipe was used with a o2 sensor mount being relocated to the rear. Cat + welding cost more than the header itself, but I'm happy.
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