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wont ruin the engine but since its a gutted pen cat it will lose low end torque very noticeable, your economy will take a hit, and your just doing too much work.
With no catalyst at all, you will get a engine light.
Remove the stock cats, replace with pre-bent piping and run no cats. Changes in exhaust diameter can fluctuate with velocities which isn't going to help you out when you need power.
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2004 Ford F-150 XLT Supercab 5.4L 4x4
Appearance: Painted Headlamps/Fog lamps, 20% Tint, Black Painted Roush Grill
Performance: PHP Gryphon 87 Perf, 2.5" True Duals X'd, Rear Cats Deleted, Magnaflow 11" Bodies, Magnaflow 4x18 Rolled Tips.
Suspension: Bilstein 5100 Leveling Struts & Rear Shocks, 20x9 XD Monsters, 33x12.5 Toyo M/Ts
Videos: Exhaust Video Burn Out Video Tunnel Exhaust Carwash Rev
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