Whooosh.

Per
Update by Per Schroeder to the Mini Cooper project car
Sep 10, 2007

Stock class autocross rules allow for exhaust system changes downstream of the catalytic converter. We bolted on Alta’s 3-inch exhaust system last week. The sound is slightly more aggressive than stock, with only a touch of drone under load on the highway (up hills at certain RPM). The system weighs about 10 pounds less than stock. We’ll be dynoing this system shortly, once the weather here in Florida gets back down into the 80s (where we have dyno numbers for this car already)

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