ok basically i took a tape measure and went underneith the car and measured the length of space in between the 2 headers.. i got 17.5 inches... now i did the same exact thing with my mac h pipe and got 18.5 inches.. so now i realize y it isnt fitting.. now im experimenting.. i want a bassani short x pipe.. whoever has a basanni short x pipe.. would u wanna do me a favor and quickly measure across and c if u get around 17.5 inches.. b/c if u do.. then i no that a basanni x pipe will fit my headers.. i mean im desperate.. and i dont have exhaust currently on my car and i need to change that.. so cna u help me!

 

Not sure if you are still going this route because I see in a later post you are asking about BBK or MAC X and H pipes. But I wanted to let you know before you thought about it to hard that according to where I buy alot of my Mustang parts (50resto.com) that Bassani X pipes only work with Bassani Headers. My opinion is if you have BBK headers get BBk X pipe. This will make all your headaches go away when you start mixing different exhaust suppliers the parts are not going to line up perfectly.

The following statement is copied from a website:
Bassani X-Pipes for long tube headers will only fit Bassani long tube headers and no other brands!