Headers question

[MXZ1983]

ok, so i was thinking about doing headers now that i have my exhaust done. these are the ones i was thinking.
http://store.summitracing.com/partde...5&autoview=sku

Couple of questions though
will they bolt up to my stock exhaust flanges/area?
How much of an increase in performance will i see?
gas mileage increase?
difficulty to install?
will they last?
sound difference? extremely louder? not much, just a tone? mildly louder?

thanks guys, any help would be appreciated
they are for my truck that is in my signature

[chevyrulz]

dont get those, they'll leak. whatever brand you decide on, be SURE you get a 3/8 flange. those flowtechs have a 5/16 flange. i'd suggest getting ceramic coated as well, although that is not really a necessity and it costs a good bit more. summit's brand has the 3/8 flange i think, and they're pretty cheap too. yep, heres a link summit headers they cost less too!

i'd also suggest full length as opposed to these shorty headers. the power, mpg, & sound will be much better than the shorties. the shorty headers, in all honesty, aren't much better than the stock manifold...


edit:

also, your power and mpg increases will be mainly @ high rpm when there's lots of CFM flowing thru the headers. there should be noticeable throttle respone improvement from say 2500-5000 rpm. the tone of your exhaust should be noticeably improved as well.

headers are a pain in the ass to install, usually...

be sure you get the 2 or 4 wheel drive version, whichever your truck is (appears to be 4x4)