First, let me say they are all good products worth considering, depending on what your needs and driving preferences are. Here’s my take on it!
The Berk’s CBE:
On the sound clips they look and sound good, but may be too loud for my taste. I still have doubts about the “X” pipe configuration for none track, street cars; inconsistent fit issues may not have been cleared up yet. Availability of the product is over for now. That being said, my biggest gripe with Berk, is not getting their products out the door in a timely fashion!
The F.I. CBE:
Yes I do think the F.I. are great looking and sexy, but they hang too low for my taste, with 18" wheels the minute I go over some road kill or potholes my exhaust system will be toast, the canisters are low, so any lowering kit is out, driving on back mountain roads in the Poconos, Northeastern PA, that low design can be a liability. Bottom line, some of these exhausts look beautiful but after a year or less on the road they all pretty much will look the same IMO. For me it was just a matter of substances and function over from and style!
Stillen:
I chose Stillen CBE, because I love the Stillen exhaust sound. Stillen has a track record of great gains, little or no drone in most cases, with that just right exhaust note that can be ratcheted up or down with or without HFC or Test pipes to your tastes. I also think Stillen did their homework on the design and function of the “Y” pipe configuration, which has been underrated IMO. The “Y’ also seems to have less issues with drone, and is better balanced across the RPM range not just at the top end of it. This makes a lot sense for the average driver that uses the car every day with some occasional spirited driving, and yet leaves the door open for headers and HFC bolt ons if you want to track it!
My Biggest gripe with the Stillen exhaust is the slip joints to many; also they could have taking a lesson in welding from Berk’s.
That being said, my new Stillen CBE should arrive on Wednesday of next week, FedEx tracking, to go with my newly installed Stillen G3 intakes. I will go with Berk's HFC after my Stillen CBE is installed.
Just my two cents
Alex