I had nice gains on an 03 GSXR1000 with Hindles stepped exhaust.
Sorry, I don't remember the exact #'s.
I went back with Akrapovic on every bike after that due to Hindles poor quality.
The #1 header didn't want to seal.
I had to use high temp. silicone on the mid pipe to can because it leaked really bad (the instructions even said too...).
The rivets in the can looked like Sh*t and the overlap didn't lay down very well.
The bleed through on all the welds were awful. I used a dremel to gring them down.
You get what you pay for. I might try a Leo Vince one day, but no more cheap sh*t
for me. Even though it performed well on a dyno, I won't buy another.