I think it's good as a for repair, about a light tune.
LETS II (CA1PA) I thought it was good for NORMAL and light tune.
By the way, my LETS II is Burial's StealthExhaust System DAYTONA's PowerAdviseHigh Speed Pulley Red Box. Surprisingly? I'm not sure if it's a good match with these, but it's contributing to a good amount of speed.
As for durability, I can't say for sure since I haven't driven more than 1,000 km with it yet. I think it will be durable if I break it in a little.

