A statement worth repeating...
Quote:
Originally Posted by ATaylorRacing
...Only after I did several other mods to the car did it finally respond to a freer flowing exhaust!
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Despite what the car magazine articles (that we all know are an extension of what the advertisers message is) adding a 2-1/2" mandrel bent stainless exhaust sytem with almost-zero-backpressure cat and muffler won't necessarily increase torque at any rpm.
I found you really need to experiment with your particular combination when tuning a system for racing, I have to believe the same would hold true for max FE.