B6 A4 1.8T 034 Motorsport HFC Before And After

[@ryancelly3468]

Did you use your stock 2.5" downpipe with it? I have the exact same hfc but the hexagon shaped flange does not match the triangular shaped downpipe flange.

[@lejas10]

Any exhaust fumes in the cabin? I’ve got a test pipe and I wanted to replace it with a hfc so I can get rid of fumes in the car

[@TravisTerrell]

(A year late, but...) No, definitely no exhaust fumes in the cabin with a high-flow cat. It still functions as a proper cat and passes emissions.) That's one of the biggest advantages of a HFC over just a test pipe. Another great advantage is sound--I find a test pipe to just sound...bad.

[@tirecchatman547]

Sounds the same don't u have to get the cat tuned for more power ...do drive any different

[@ryanhanauska463]

Not with just a HFC. If you went to a test pipe and intake you might be at the limit of the computer's ability to compensate but they're pretty smart and flexible so you might still be okay

[@lsm1m712]

Hi, I'm thinking about going hfc but do you know if cts turbo will fit directly bolt on to the stock exhaust/downpipe? 034 hfc says it does but I wonder if cts turbo hfc is same. Both are 3" so might be okay but I'm not quite sure.

[@bigbootyanime3630]

Well if the turbo can fit directly to stock cat than yes or you could get a big turbo kit that has a down pipe with it

[@PKM1ful]

I can’t note the he difference