[Viper3812]

I have a few questions for my upcoming swap.

What diff do you guys have or reccomend? Is A 3:45 a good choice?

I already have bavauto springs and bilstein sports, so do I need to change my front springs and struts to 325 springs and struts or will I be fine?

What exhaust setups are you guys using? All custom or did you buy a cat-back and cut it? I was thinking of whatever header I can get a hold of, AA trackpipe then idk what for the cat-back (AA Gen 3 cat-back modified)?

Do we need to get the 6 cylinder expansion tank for cooling? If so, where did you guys mount it?

Thanks.