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Upon further investigation (although the ultimate test is a dyno read) I found in the June 2010 copy of Car & Driver the following quote from the Dinan tries to improve the M3 and the 335i" article page 118.
" Steve Dinan has sold more than 2000 software upgrades for the 135i/335i, making it the most popular upgrade in the company's 31 year history. And it's easy to see why. For $2199, a simple download at one of Dinan's 129 US dealers immediately endows a 335i with as much as 384 horsepower and 421 pound feet of torque. (versus 300 and 300 respectively). Dinan notes that this is actually more like a 60 hp gain, as BMW's twin turbo inline-six comfortably makes more than the advertised 300 horsepower in stock form."
Budds sold me the vehicle based on the Dinan providing 384/421 with just the flash. Their website and Dinan's site also suggest the same. Not looking to get too excited about the whole thing, but it appears I will go with the 3 data points above.
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2010 335i xDrive Coupe, Titanium Silver, MSport 6MT
2006 325i Sparkling Graphite Sport Package 6MT Retired
1999 323i Titanium Silver, Sport Package, 5MT Retired
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