Thinking about a catless downpipe for your turbocharged BMW?
Skeptical about the manufacturers' claims, as listed below?
aFe: +14 hp, +39 ft-lbs
AR: +20 hp
Berk: +23 hp, +30 ft-lbs
CP-E: +17 hp, +21 ft-lbs
Shifteck: +25 hp, +12 ft-lbs
Vishnu: +11 hp, +29 ft-lbs
VRSF: +25 hp, +30 ft-lbs
Average claim: +19 hp. +27 ft-lbs
How accurate are these claims? Will you see any gain at all?
I put it to the test.
02 March 2016
2 dyno pulls with stock downpipe. Then, the Active Autowerke catless downpipe was installed that day.
09 March 2016: 3 dyno pulls with the AA catless downpipe.
Average gain: +18hp, +24 ft-lbs
