I have Arizona Speed & Marine long tubes headers on my truck, i plan on building a new exhaust from the headers back, catless dual 3inch, i noticed after installing the headers that they are 2.5 inch collector's is this bad for my FI set up? I see lots of guys running 3 inch flanges with dual 3 inch piping all they way out back, im not sure if i should get different headers? or can i still some how do dual 3 inch piping at the header flang? mods are in my sig. someone help me!

 

I don't know too much about FI setups, but I would have to imagine that a free-er flowing exhaust is better. If thats the case, I would say a 3" merge collector is a good thing. Might want to consider saving on buying a whole new set of LTs, and buy a pair of 3" scavenging collectors and have them welded on in place of the collectors you have now. It will be about the same cost as a new set with the Tig welding and the collectors but they will be better than new.

 

Wish i never bought the az speed and marine LT headers, seems like i wasted some money. do you think that a real clean free flowing 2.5 inch dual catless exhaust with E-cut outs would flow decent for my set up ? or am i **** out of luck and have to bite the bullet and buy new Long Tubes. thanks for your input.

 

Any one else want to chime in?

 

My stainless works has a 2.5 collector so I don't think it is that huge of a deal. build you a solid dual 3", high flow cats with an x-pipe and some good straight throught mufflers and you should have sufficent flow. Some people are running 2.5 pipes with a FI set-up so go figure.

 

Thats what i wanted to hear! i was hoping i could just build a real solid 2.5 inch thanks for the input! any one else care to chime in???????

 

I don't think dual 3" is necessary either. Do use the 3" cats though.

 

thanks for the info