If i already have flowmaster 40 series-s and i want to get headers do i have to change my set up? or will it still work and be street legal

 

keep the flowmasters and get ur self some long tubes. I bought OBX headers which came with an off-road h-pipe and a resonated h-pipe. had it shipped all for 480$. now most long tubes r more expensive but for the price and quality of these headers i cant complain 1 bit. check on ebay. type in 3v headers

 

you should check w/ you states laws for legality. if you're in CA you cant use LT's or o/r midpipe.....legally. in my state you need cats, but there is no way to test it so everyone here runs o/r mid pipe.

 

with long tubes do i have to cut any pipes now or will it all fit perfectly?

 

fit perfectly. ur stock manifolds r bolted to ur stock h-pipe. those bolt to ur pipes that go out to your mufflers. longtubes replaces ur manifolds and ur h-pipe. they will bolt up to where the pipes leading to the mufflers where left

 

what brand do you guys recommend?

 

if u get LT's you MUST replace the midpipe. the stock manifolds bolt to the midpipe right before the cats. the LT's are much longer than the stock manifolds thus requiring the midpipe replacement. shorty's just bolt in but not LT's.

ARH, and Kooks are the best, stainless works are good also. these are 1000 and up.
I like my BBK, for LT's and o/r x was $750.