I will say that IF anything, you should treat the intake-blower path as a high-revving engine. So bigger is usually better. The blower is running around 14,000 rpms. Even if it's only 10,000, it gonna follow the large cross-section, high revving philosophy. Which is why we have a 3"+ intake pipe stock. What's the size of the throttle body on there now? Is the SMS one actually designed for the LSJ? It seems alot of their stuff is designed for the other Ecotecs, and if it fits ours, they sell it as an LSJ upgrade...
'05 Stage 2 Redline -One of the few Red REDlines
Sp00n's HP Tuned GM Stage 2, K&N CAI, SFPH 2.8" Pulley, GMPP Exhaust Manifold, B&M Shifter, GMPP Clutch, Eibach Drop, Stillen Rotors, ZZP Stage1 Axles, URC-Subframe, TqForward Strut Bars.
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1/4 - 14.0 @ 103.7
Red Red Line Club #001