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My dealer had a 435 with the stock exhaust beside a 435 with the M performance exhaust. He started them both up so I could hear the difference. Both brand new cars so neither exhaust had any miles on them. It was a noticeable difference. Not a lot louder...maybe 20%...but it has a meaner bark to the exhaust note. It has a nice aggressive tone to it but not at all obnoxious sounding. It attracted several costumers to walk over and check it out. Hearing them side by side was a nice comparasion. It made me check the box and spend the extra $$$ for my 335i that I ordered.
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