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Old 02-24-2020, 06:51 PM   #5
Scooby Specialist
Member#: 97043
Join Date: Sep 2005
Chapter/Region: TXIC
Location: Tomball Tejas
08 STI
02 Z28 - project


Not worth it IMO. Pretty common to see turbo LS motors running the factory intake manifolds and throttle bodies (86-90mm IIRC).

Guess you could build a manifold to fit the flange then guess correct upper plenum volume, plenum floor height, and runner dimensions. If you're that good, I'd convert to a 4150 style throttle with delayed secondary butterfly.
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