Yes, its too big for the R/T unless it has heads, cam, etc......you most likely lost back pressure / low end torque
3" Exhaust on 5.7 Challenger automatic
Do you think that the 3" Cat back exhaust system on a 5.7 automatic Challenger is to big and would it lose HP instead of adding? I Installed my 3" Cat back and the car litterly SLOWED down quiet a bit. Any Info would be helped here. Thank you
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He already did try it out, and he stated his car is slower 
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