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The BBK Vari-Tune cat-back for 1987–1993 Mustang GT replaces the factory exhaust with a direct bolt-on aluminized steel system designed for GT models only. Vari-Tune mufflers include an adjustable stainless power valve you set and lock with a wrench, letting you fine-tune sound and flow. Typical improvements cited are 8–10 dB louder output and roughly 10–15 hp, with aluminized construction and bolt-on fitment.
BBK 87-93 Mustang GT Cat Back Kit Varitune Mufflers - Aluminized turn downs
