well i can share with you that Tom with Techworks isnt really running anymore, so ive heard. The site is operational and thats about it. Ive sent emails inquireing about the headers, never got any responses for about a year or two.
is it crutial that you get 2.5"? most of the NA exhaust are all 2.25" as i just completed by exhaust buid and that was the trend i was noticing.
i believe magnaflow and possibly borla is 2.5"