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The stock Tb goes from ~55mm on the inlet side to 46mm at the butterfly to 55mm at the intake manifold. So boring it out to 55mm is very helpful. The intake manifold inlet is already 55mm. So no porting of the intake manifold inlet is needed.
55mm is as big as you can go with the stock TB, there isn't enough material to bore more. Supposedly you can bolt on a 60mm TB from a minivan. I don't know about this or not, but I've heard it can be done. Then the manifold would need to be opened up on the inlet. More airflow is generally better but you can get too much. Somethingthat say your head or exhaust manifold can't get out fast enough then you aren';t doing any good.
"To strive to seek to find... and not to yield." Michael J. Kulaga e-mail: Michael_97RS@2gntDSM.zzn.com aol IM: MJKulga Website: http://highlander.dsmpower.com/
Injen CAI w/ K&N Breather Filters, AFX UDP, 55mm TB, GS-T Muffler, FU/RU/RL STBs, Front NRG Susp. Motor Mount Ins., Red Silicone Hose Kit, 8.5mm Magnecor Wires, Bosch Rapidfire Plugs, TSW Blade 17x7.5, Bridgestone Potenza RE730 215/45ZR-17.
And in my Room: Rear disc brake conversion kit, SS Brake Lines, Intake manifold 4 porting, Rear Motor Mount Ins. Silver Cadmium Plated KVR Cross Drilled Rotors and KVR Carbon Fiber Kevlar Pads.
Waiting for from RRE: Front Lower Tie Bar, SS Clutch Line.
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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