what size headers will replace stock headers with a stock crossover pipe, and i could just put them on in my garage right? no welding on anything thing?
Not really sure exactly what you mean but here you go.
The stock headers are un-equal shorties. What headers would match the closest would probally be 1 1/2" tube headers, but you could step up to 1 5/8ths but you might loose some torque. The stock pipe size is 2 1/4" but you can upgrade to 2 1/2 and everything should bolt up.