What year is your car? If any year other then 97 you will need to have a CASE learn done. This can be a major pain finding a dealership that knows what you are talking about. Your best bet on that is finding a member near by with software to do it and not risk having your new tuned PCM flashed back to stock. Something that can happen if the dealership doesn't understand what you need.
Intense is your best bet. They deal with more Bonnevilles and have a good tune. The PCM will run you $99 I believe with a $100 core charge. Plus the CASE learn. Where are you located? I've flashed a few PCMs.
SAVING THE WORLD ONE BONNEVILLE AT A TIME
1997,1998,2000,2005 year confused Bonneville SSExi. Stock? ish.
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