I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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Do a leakdown test, and a compression test to make sure the engine can take it. Otherwise, 120K is not high mileage for a 528.
Your problem might be the transmission. It's made by GM, it's not especially reliable over 100K, and I'm not sure that it will take the extra power. You might want to do a manual swap.
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1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.