I went with a catback first, but if I could do it again, I would probably do LTs and ORY w/ a manual cutout first, then get a catback when I could afford it.
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2002 Z28
LTs | ORY | Magnaflow Catback | Vigilante 3600 | SSRA | SLP Lid | UMI Suspension
12.47@109, 1.67 60' |