ya, on a boosted car with/without cams it would for sure have differences.

 

What would be louder the MD 5/16 or 1/2?

 

1/2"

 

[QUOTE=You don't have to get the copper iso thermal, you just need to remember to keep the bypass valve open during the winter when temps get lower than 32* so that the throttle body doesn't freeze. The copper is just a good way of not having to remember to open/close it.[/QUOTE]

So if I don't get the copper iso thermal, I have to go inside the hood everytime the temperature goes above and below 32*?

 

just do it seasonally... If you are in climate that gets that cold, open it in the winter and leave it until spring (or whenever it gets warmer) then close it till winter again... but even if you had to do it more often, its real easy - takes less time than checking your oil.

 

I guess I'll just have to get the copper one.
... And yes it does get cold here in NY...