carguycw |
April-10th-2003 10:58 AM |
Few newer vehicles benefit AT ALL from "free-flow" catalytic converters. Car manufacturers have figured out how to make good cats; aftermarket units usually only help late 70's and early 80's vehicles that came with older, more restrictive designs. About the only time that they will help on a newer car is if (a) the engine is modified enough that it needs a larger-diameter exhaust system and the stock cat has become a bottleneck, or (b) the car is powered by a rotary and/or turbo engine, which are more sensitive to backpressure that a n/a piston engine.
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