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I think moussolini found the trick, He has the 4-1 w/cat on his EX auto. He didnt need any mount mods or any crap like that. However, everyone else that has been griping about fitment problems has a 5 speed. (i.e. Allman who i believe shaved the mount)
I say we make a poll to figure this out:

Respond if you have it and list any troubles PLUS must know what type tranny u have. I don't see why the mounts would be different on manuals though.... maybe its not and the corrected headers are on the market. who knows, lets try and figure this out! I want a header!

 
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is it possible to have to hp header and cat with a TCS exhaust?

 
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and about fitment, i have a friend who bought and installed the header, he has an automatic EX and had no problems.

 
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Yea i had no problems with the install, but after about 100 iles my check engine light came on, my friend said it was cause the O2 sensor wasnt use to the new cat yet, and for me to reset the light. Other than that the gains are real noticiable. sounds nice also..

 
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Sounds like the fitment issues are coming from the manual trannies and the 4-1 w/high-flow cat. There is supposed to be a corrected version out soon. Sooner the better.