NMxr7SC said:What size are the stock downtubes after the cats outside diameter? Thanks
No!.. stock downtubes are 2" in diameter. The combined tube from the resonator is larger, then splits again into 2" tubes. This is one reason the stock exhaust is rather restrictive. 2.25 is a significant upgrade in flow capacity.tjsc87 said:I believe they are 2.25 then the center is 2.5 and it splits bak to 2.25