What's the OD of the stock downtubes?

thanks. I was just wondering if Tbird88's downtubes will slide right into my flowmaster resonator or if I will need an adapter.
 
tjsc87 said:
I believe they are 2.25 then the center is 2.5 and it splits bak to 2.25
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.
 
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