mufflers

[Martice]

Hello-

How to choose a muffler size? Stainless steel or not? Big tail pipes are the key to the deep sound; the CRF is the key...

many people choose mufflers that look and sound good over mufflers that make better power(witch can't be proven) and look or sound bad...
So are there any tech articles about mufflers for aircooled VWs?

I would need any tech info regarding the design of a good type-4 muffler.Or what is the key to the deep sound???

thanks in advance!

Martin