[notmytarga]

I have 2 sets of these, somewhere. One of the four even has a leaky weld as described by Henry. I am now running SSI's. The other set are from an identical core engine I came across. (Both are 1975 California engines, which had the thermal reactors even earlier) The volume of each exhaust path is not matched and thus they are less than ideal. The manifold inside of an SSI has all the tubing the same length and beautifully curved to make it all work out to where they are joined. It is oft said that the performance increase with the SSI or stock pre '73 is 10 HP over the bypass or TR. My butt dyno felt it - but there was 8 months and other changes in there too.

I talked with Harvey Weidman (wheel guy) about how these thermal reactors replacements were fairly quickly made up when those engines were dying early. My '75 S had them on when I acquired it. The car hadn't been driven much since 1984 and only had 40K miles on it. It also had tensioner collars (one broken and thus worthless/dangerous) and the toilet flapper in the airbox - pretty good updating in its first 9 years.