Like stated above increasing plenum size rarely has an affect on sfi engines, now throttle body and carbs. Its a huge deal. I would start with tuning exhaust NOTE : bigger pipe will not increase scavaging!!. You want velocity without restriction. Then tune the intake, go to an actual tuner and then youll see some differences. Btw chrysler spent a lot already doing this. But they probably went more economy.
The ONLY chlorophyll JK
one more horse power than the average pentastar;
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