Not related to the roadster, we inspected ebizeds car and mine from below and there was no difference except for extra struts which were well away from the exhaust.
Given my experience and if i had to buy another exhaust i would definitely not pick the stillen.
On the plus side i love the noise but....
Down sides:
Absolutely awful workmanship. The garage had to file down loads of the welds to get all the bolts to fit flush.
The inside of the exhaust was marked and scratched.
It sits too low and nearly touches the cross member causing vibrations. Its a well known issue thats common in the usa. The garage really had to work hard to give enough clearance.
Its only 4 months old, regularly cleaned and the welds on the back box are already starting to rust
When compared to the stillens bought by chris-i and ebized its clear the exhausts are no longer made by the same team / process. Most probably sub contracted out.
In addition stillen were very unhelpful when these issues were raised. Thye stated it was the garage who fitted it improperly....sigh.
Biggest problem though is fitting the berks. I love the sound of the berks hfcs and wanted them on the 370. 2 sets of hfcs (berks and stillen) and 3 garages later, (2 of which are specialst fitters with knowledge of zeds) and it was a no go. They stated the angle of the stillen was out and that it was totally incompatible with the hfcs, its not even close. I was gutted.
Still its on the car now and sounds and looks great, but i wouldnt buy one again. Wish i had kept to my first instinct and got the invidia gemini. Still tempted to shift over and add some berks lol.