the liters is the total displacement of the engine.

 

since your intentions are too boost......stray away from the d15 and go z6........the aftermarket support is greater for the 1.6. although dont get me wrong the b7 stock will do fine under boost for a while if done and tuned right. and doing a mini me will raise the compression some allowing you to make more power at the same boost levels as long as your tuning is up to par.

 

Well.. I have a D15B7 eninge... its got 130k on it... the tranny is blowen but the engine is solid new timming belt and well taken care of.. looking to sell it cheap so if you end up wanting a b7 i have one