shouldnt the catback also fit the 4 cyl?

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1999 Toyota 4Runner 3RZ (Base Model turned SR5)
BF Goodrich All Terrain T/A KO (265/70/17) on 17" Gunmetal Tundra Rims
Viper 791XV 2-Way/Remote Start, LCE Headers, K&N Intake, Sport Hood, Billet Grille, LED tails, Clear Corners and bumpers, replaced tons of stuff.
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