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I have had the 1-3/4" primary tube TTI headers on my big block dart for a few years now. I have been gradually stepping up the horsepower and am now at the point where the small primary headers are the bottle neck. SO...........I ordered a set of the 2" to 2-1/8" step headers from TTI. I also...

well i got my 3" TTI exhaust mocked up today. Fit is absolutely perfect. had to trim a little off of the X-pipe fittings to let them telescope in farther. after about a half hour of fitting it sits super tight up against the floor boards. it is actually all level with my frame connectors. best...

I have a 67 dart with a 383/auto. has TTI headers and just ordered the TTI x-pipe this afternoon. I plan to run the collectors right off the headers into an exhaust dump out with the electric dump valves. this will then go into the x-pipe and into my flowmaster mufflers with turndowns in front...