Hi Chris
Yep, so am I! It's slightly louder but the bass isn't anything like as clear :( I've had a JBL 300w 4 channel amp on some SPS171a's in a previous car and it was a lot of work, but worth it :)
If I have to add an amp, I will, but the question in my mind was, which is going to get me better results, amping the standard speakers, or new speakers with no amp. Guess I know the answer though, I just dont want to hear it ...Might just go the whole hog and amp some components 
2004 Bora Sport 150 TDI | OEM Xenons | Cruise | 17" Longbeaches | Aero Wipers | Sports seats | Miles to empty
2001 Golf Mk4 V5 170 :)
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