Was not a numbers game as much as just stating how badly those compnents combined with 87 octane based tune are holding it back. Just losing the factory cat and muffler is probably worth 15-20 HP with the OEM manifolds and Y-pipe in place. I have seen 30+ TQ gains through alot of the powerband with Timing/Fueling changes alone on a STOCK engine. Running 91+ octane fuel you can run 12-16* of advance at 1,200 rpm and 100 KPA and bring as much as 28* advance in by 2,800 rpm. Above 3,600 rpm you can bring it up to 32*. Compared to a factory GM van tune that goes negative on a WOT throttle hit from a dead stop and peaks out at 20-22* as late as 4,000 rpm, it makes a world of differenc. Especially combined with air/fuel ratios that approach 10:1 on the factory tune in places. Bypass the PE fuel delay and set the PE to deliver 12:1 AFR from 1,600-3,000 and taper off to 12.6 by 4,000. Finally set your stoichiometric AFR to 14.1 to compensate for E10 and dial in your VE tables.
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