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As from what others have said, all headers require moving the harness. You do get what you pay for, and thats why I only recommend Kooks (What I personally chose) ARH, or CSP.
With other brands you can get lower quality steel, worse fitment, bad QC, poor customer service, and more. I always suggest a heat coating as well, just for long term durability. Ceramic wires are also a benefit for this reason.
I am a little confused on what you mean by the stock manifold gives you 10-20hp? How does a stock part just randomly gain you horsepower?
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Instagram: RideWithDanger
Current Mods: Rotofab, Ported LT2 intake, LT5 TB, Kooks Headers, AWE Touring Catback
Radiant Red 23' 2SS 1LE
1100: 11/14/22 | BUILT: 3/16/23
2000: 2/17/23 | 4200: 5/8/23
3000: 2/27/23 | 5000/6000: 5/15/23
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