i have weleded collector flanges of my pacesetters but they won't seal, i think the driver's side got warped when they expanded it(it was a 3in->2.5 reducer). so i am going to get these, what size should i get the 3.5->3 or 3->2.5 or 3in->3in?
collectors

 

get these they are a much better design
http://www.headerbuddy.com/headerbuddy.html
If it gets deleted PM its a link to the ORIGINAL ball and flange design Flowmaster's is a knock off.

 

my only concern is it won't seal bec of how the one that was weleded on is warped, and also it might hit the 02 sensor, bec for some reason, they cup off part of the collector
what size should i get?

 

thanks everyone else

 

I just bought the ball flange from summit. I got 3"-3". The 3" will fit over the Pacesetter headers but will not fit over the Y pipe it is the same size. I am going to take the 3" up to the muffler shop and have them bump it up alittle bit. You will have to cut the Y pipe back to make up for the added leight of the to flanges put together It might fit over the smaller part of the Y pipe if you have to cut back that far. I am going to try it friday I will let ya know how it works