Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars. Thus, removing as much exhaust flow restrictions will increase horsepower and torque significantly. The ...

Horsepower is important. That's why you're doing those mods under the hood. You're trying to get as many of those ponies as you can out of your turbocharged engine by increasing airflow as much as ...

Clearly Fred Su, the owner of Evolution Racewerks, knew something I didn't when he declined to ride shotgun during my test drive of his modified 328i. "Motion sickness," he claimed, but there was more ...