Here is the dyno with just the exhaust done this shifted max power to 5,700 Rpm from 5,300 a few more upstream mods since this have seen max power shift to about 6,300 RPM . What is also eliminated is the dip at about 6 grand on the stock exhaust.
Note the red dyno line already had some intake work done upstream of the intake manifold which shifted peak power from 5,300 to 5,500
Used to be slow getting to the red line before this now hits the rev limiter frequently in second and easily gets there in third.
M52 vs M50
in General Discussion
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What had you done upstream of the intake manifold to shift the power before the headers went on?