Want to put headers on my car money is always a concern but does anyone know if these will work it says in the ad the collector is 2.25 but i emailed the seller and he said it actually is 2.5
http://m.ebay.com/itm/121352183414?_mwBanner=1 anyone know about these

 

I know you don't want to hear this, but beware of the Chinese headers sold on ebay. They have a lot of fitment issues.

And since those are long tubes you will need a new H or X pipe so when you get them you can choose the correct size mid pipe to fit. Most aftermarket stuff is 2.5

 

like dawson said, beware. Mustangs are very tight in the engine bay and poor fitting headers will give you trouble. I wont say all cheap ebay headers are bad, I bought a stainless sbc set for my test stand 406 and other than the cheap gaskets, they are quite nice.