Hey guys,
Just the good old question about the exhaust system, 2,5" or 3"?
I have a 440 HP engine in my '69 Coronet R/T, got the TTI headers with 1-7/8" primary's and 3" collector.
Now to continue this pipe, go 2,5" or 3", as per TTI the 2,5" system is good for up to 475hp.
Engine is not stock...