Oh, summary of gains from all mods, based on SAE corrected whp/wtq
at 5252 RPM, when hp and tq are equal...
Bone stock = 219
+K&N panel filters = 222 (+1.5%)
+Test pipes = 232 (+4.5%)
+S-tune catback = 235 (+1.5%)
+HPS intake tubes = 238 (+1.5%)
+Tune = 244 (+2.5%)
Cumulative gain @5252 RPM from Bone stock = 25 (+11.5%)
Again, this is just a summary of changes at 5252 RPM's, when hp and tq are equal. Although gains will vary in hp and tq throughout the rev range, this should be a good indicator of overall gains.
Individual results may vary...
Note: I'm surprised to see some evidence of gains for the HPS tubes looking at the data this way... I'll upgrade my review to "somewhat worth it".