stock replacement headers?

[Sniper X]

I heard that some companies make a shorty header that directly replaces the stock exhaust manifolds....anyone here use them? Do they REALLY DiRECTLY replace the stock manifolds as in take the stocker off, put the shorty's on, bolt the exhust system up to the new ones without modification and roll on?

I hope so, because I sure would like to keep the exhaust that is there ....well, there and just reaplce the old leaky exhaust manifolds!