The short answer is no, carbon buildup is not an issue.
The longer answer is that lots of things will cause massive drops in power.
An example: Old spark plugs are a big deal on the S65. Because they are also used for knock detection, fresh OE plugs are critical to achieving full performance.
__________________
2011.75 E90 M3 | 2006 GMC Sierra LBZ | 2004 X5 3.0i 6MT | 1995 M3 S50B32 | 1990 325is | 1989 M3 S54B32
Hers: 1996 911 Turbo | 1989 325iX
|