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I am not supercharged; just a 2017 SS with Kooks headers and cats. But the benefits of headers on a supercharge engine will be the same or likely better.
On the stock manifolds and cats, my car made 393 peak WHP and 416 peak WTQ.
With 1 7/8 headers and cats and on the same dyno, it made 421 peak WHP and 408 peak WTQ.
So gained 28 peak WHP and lost 8 peak WTQ. But...
The significant gain was power and torque above 5000 rpms. Both HP and TQ were maintained much better from 5000 up the redline.
At 6500 rpm before headers, WHP and WTQ were 355 and 280 respectively; after headers and at 6500, WHP and WTQ were 410 and 330. That is a gain of roughly 50ish WHP and WTQ in the upper rpm's which is amazing. That is equivalent to a cam swap. These engines just want to breath.
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