Originally posted by DemonSVT:
Originally posted by giddyup306:
Most will tell you that 70mm is overkill for a n/a 3L but, if you keep the secondaries functional, I don't think it'd hurt especially up top.


Considering the engine can't use but half of it's flow potential and the added size hurts velocity and causes a much greater pressure drop right at the mouth of the intake manifold. Gee why would people say it hurts performance???

A widened SVT UIM mouth is 67mm. You would have to port the UIM back a few inches to even allow the 70MM TB to flow properly.

Then do the math.
70mm TB outlet has a 73-75mm inlet.
The stock rubber boot is ~50mm
The SVT boot is ~54mm
The BAT pipe is ~62mm
The "huge" CTA pipe is ~72mm (That's 3" piping folks!!!)

The stock MAF has a flow area around 53-54mm


So large, small, large, small is how the incoming are goes. You can imagine this is not good for conserving energy & velocity. That is lost efficiency plain and simple.

BIGGER IS NOT ALWAYS BETTER!!! Far too many people just do not get this novel concept of flow dynamics.



Some people don't believe in doing some extra work to make things do-able. Not just direct bolt-ons.

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