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A header is not worth it... only if you are going turbo. Otherwise, get one.
The tubular design does increase the smotthness of the airflow. the equal legnth runners also let the exhaust gas pulses not interfier with each other, as they do on a stock exhaust manifold where the pulses interfere with each other. and try to push a higher volume of gas through the smaller sections of pipe. So basically anything but future turbo plans and I recommend one.
Una salus victus.

Michael J. Kulaga e-mail: Michael_97RS@2gntDSM.zzn.com aol IM: MJKulga http://highlander.dsmpower.com/
All motor in the making.
Injen CAI, 55mm TB, P&P Intake Manifold, Hooker Header, GS-T Muffler, AFX UDP, S-AFC, 8.5mm Magnecor Wires, Crane Fireball HI-6DI2, SS Clutch Line, NRG Susp. Motor Mount Ins., FU/RU/RL STBs, TSW Blade 17x7.5, Bridgestone Potenza RE730, Front KVR Cross-Drilled Rotors & Carbon Fiber Pads
To Be Installed: P&P Milled Head, Rear Disc Brakes, Rear KVR Cross Drilled Rotors & Carbon Fiber Kevlar Pads, SS Brake Lines
Firefly: Mal: You don't know me, son, so let me put this to you plainly: If I ever kill you, you'll be awake. You'll be facing me. And you'll be armed.
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