| bigger = slower spooling but more air flow
smaller = faster spooling but less flow
bigger is for more top end
trim is related to shaft speed
bigger trim is more efficent at higher boost, but a dog in low boost
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'01 Civic EX -- boosted
'99 Chevy 2500 Ext. cab 4x4 with a
454 <--- under 10 mpg
'02 Chevy Trailblazer |