I ordered an american thunder flowmaster system here and a bit confused. I called up flowmaster before I ordered and told them im getting a high flow cat from dynomax and asked what system i should get, I told them I wanted a 3" system and blah blah blah, i was told to get part # 17234 since it has a 2.5" inlet which is close to the high flow cat, and that it expands into 3" right after and goes into the muffler and then comes out as dual 2.5" . Anybody know if this is true or not, cause they also have a 3" inlet system which im guessing stays the same all the way to the muffler, that is part # 17233. Just wanna know if this person lied to me. Thanks in advance.

 

I have the 17233 Flowmaster American Thunder cat-back, it has a 3" inlet w/ dual 3" outlets.

 

If you want a 3" cat back then here is the part # 17233 from jegs.If you want a 2.5" cat back then the part # is 17234.