I think it's quite possible that they will show greater gains. If the only difference is in the tuning, the tuning will be the same once the kits are in.
'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