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My IS300 has a T66 with all supporting mods and 264 cams. I am upgrading to a SP77 and am going to ditch the cast manifold for sure, and from the little research i have done the next major restrictions are the head/intake. My questions are:

Which one is the bigger restriction? I assume it would be the intake and TB?

How does a ported NA head flow compared to a TT head?

What aftermarket intakes and TBs are available?

Any info would help. Thanks.

Travis
 

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Cheifbootknocka
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Allan"Defiant7M"Sterling said:
I would say the head is the most restrictive.
I agree, I have seen a few high HP rides with the NA intake manifold.
With that said I would still fab up a new IM with a billet 75mm TB or larger.
 

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TB is the most restrictive period, ge head will flow close to a gte head but the real difference again is the intake manifold.
 

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on a TRD flow bench, the na head flowed more volume then the tt head. TB is the major restriction.
 
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Are you running a non-VVTI head? Is there anyone that has swapped over and made a parts list of what you need?
Regards
 
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