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Discussion Starter · #1 ·
I'm planning to get a new TP i see most ppl heer running 70 and 75
my modsd are magnapacks with o/r h , UDPs, CAI, 373, shift kit(auto) , egr delete ,sct with bren speed email tune
btw what is the stock TP size for 99gt ? will i be able to change teh TP with out the plenum
 

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I thought stock was 65mm?
65mm = 616 cfm
70mm = 726 cfm
75mm = 850 cfm
 

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Cones = Yummy!
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Hey everything I'm reading is saying 70mm for N/A and not to touch 75 or 78 unless your boosted? Does anyone know the real issues with running a 78 on a NA motor? is there just less benefit or can it actually degrade or cause a problem? I would think for the bbk combo price it would make sense to get the 78mm then if you boost it later it's ready, and if you don't no harm right?
 

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a aftermarket TB will work on the stock plenum, the TB will give you a couple HP and make the motor respond faster.
 
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