Which canisters do you recommend for an Evolution/MVVS 45. I have read a bit on the topic and it seems the length of the header is of great importance. How do you figure the optimum length?

Also, as a main rule, is a bigger can better?

I've been looking on Krumscheid's (KS's) 88 VS-4 or 86 VS-4. Is it an advantage to pick the 88 mm for best performance?
http://www.krumscheid-metallwaren.de...EN&anr=88+VS-4

I also need a header and though of this:
http://www.krumscheid-metallwaren.de...=EN&anr=1525-2

What about MTW (http://www.mtw-daempfer.de). How do they perform compared to KS?

The engine is going in a H9 Extra 260 and is going to have the cylinder hanging like the picture below. Any suggestions or perferably experience for a well performing set up with this engine?