naki_k wrote:What are the suggested figures?
AJ6 claims ~10% performance gain, including their uprated ECU.
That's roughly in line with the increase I got modifying the pocket rocket's intake system...
(gain on the BMW is higher because the M52B28 intake manifold was designed with built-in restrictions)
Combined with the center exhaust replacements a 40-ish bhp increase shouldn't be unrealistic.