I have Hedman 1-3/4 headers on my 63 now and I made the 3" system on it. I bough the universal H-pipe from summit and then bought 4 ft lenths of 3" pipe and mig welded my system up. But I am building a new eng and I just got my complete 3" X-pipe system from TTI and the 2" nickle coated headers from TTI. What a great product they sell. The 3" system looks great and everything comes with it to hook right up to the headers. So I had the money and I am glad I bought the TTI system. I paid $690 for the headers and $589 for the complete exhaust less mufflers as I will use my Ultra-Flow mufflers. Yes TTI is pricey but it is a quality system worth the money if you can afford it. Ron