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unless you baseline with cats etc. in place. Even then, it may not be *lost* but *moved*. Reduction in backpressure causes loss of torque on low end, but increases flow on top end. So you feel it in daily driveability. But 1/4 mi et may improve (Phuong's did) and I suspect a dyno before/after reflects worse numbers down low, with higher peaks. So. For a dyno queen, let em rip. For a top end car, or 1/4 mi car, same thing. For street grunt and fun, keep 'em. Just MHO. Based on posts of others and experience with other cars.
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