So, here are a few graphs that show gains. The only 5th gen example is from Alex. It's not quite apples to apples for you there are relative gains that can approximate the gains that your car could see.
Blue - 09 OBXT with 18G, TMIC, injectors, TBE
Red - 2010 LGT Stage II with BMC bellmouth DP
Green - 2010 LGT with BNR HTA68, FMIC, injectors
Purple - 2010 LGT swapped HTA68 with Blouch 20G-XT
About 85 HP at top end from Stage II to HTA68
About 120 HP at top end from Stage II to 20G-XT