Let's see... I put a '73 400 in my '81 TTA, went with Hooker Super Comp headers and then switched to the Ram Air III's Cast headers, which are '70 reproductions, since I had a '70 intake also.
I had no problems with either, installation was fine, but I have heard complaints from those with the 2.5 inch version not sealing to the flange all that well. I bought the 2.25 inch model.
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