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Considering that the BB and GTI-R engine are supposably the same except for the three things listed I would like to know how much of a difference the individual throttle bodies make. It's cool and all, but if I would say get a BB and swap the stronger rods in and ...i know the hp gain on bolts is zero, but they are saying BB = 105ps = 102hp and the GTI-R = 120ps = 117hp is just from the throttle bodies? I noticed that BB's had 8.5:1 compression where the GTI-R had 8.3:1. Are they running more boost in the GTI-R? What's the 15hp coming from?
 
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