How restrictiver are stock headers on my 5.0, its either get a pair of summit headers or some underdrive pulleys, how much of a difference will the headers really make...

EDIT: keep in mind ill be running an ORH and magnaflow catback

 

Without the rest of the exhaust, headers wont make any noticeable difference. New headers would be a good upgrade over the crappy, dented and bent up stockers.

 

I'd take the exhaust setup over the UD pulley kit.

 

+1
Go with the headers

 

+1 quality sound and performace.

 

I'd take the headers over the pulley's.
I would try however, toget something a little better than Summit headers. The old deal bout 'you get what you pay for' is still true...........

 

I heard summit headers are fine, i cant really afford anything else unless i skimp out on my catback

 

stock manifolds

 

Take a drink using a straw. Now bend it. Now try drinking from it while its kinked. Thats how restrictive they are.

Tube style are headers, the thick cast iron pieces are manifolds.

 

stock tubular manifolds