Let me take a shot at this.
Probably the best way to tell about increases in hp is on a dyno.
You really can't compare someone elses times to what you may run. There are a ton of variables that can cause different times - driving ability, track elevation/tempature, stick/auto, just to name a few.
You could run a 15.0 one time and then do some mods and actually run slower after, does that mean the mods didn't work? No, it could then be a traction issue, or many others.
Best thing to do is - break in the engine, then do a baseline on a dyno. Then after doing mods, you can re-dyno and compare the results.
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