This thread is about coming up with thr best priced replacement tranny setup for K-series motors, specifically my 06-11 Si K20Z3. One of my goals over the winter is to make a backup tranny for my Si. But, in the process, we'll find out the differences from other K-series chassis and see what fits them too.

So far, I've heard that EP3 5-speed trannys and rsx base 5-speed trannys are the cheapest OEM trannys to get.