I have had the GL1800 CSC trike for 6 weeks. My wife and I have really enjoyed it.
I have done a lot of work to fine tune a number of issues... Super Brace, Fork extension, weld drive shaft, brake pedal, etc.
I find that acceleration out of first gear is not very good. In fact, If I am by myself, I will just start in 2nd gear, unless it is an uphill.
Are there any power, or performance enhancements that are efficient and worth the money?