I would say 2.25 Stainless......I have it on my 4.0
And as far as mufflers, Borla Tops anything that ive ever seen. (sound AND performance)
Take a look at the Borla Pro-Xs series mufflers, I have center/offset which is the shortest Borla muffler, which in turn is going to be the loudest (soundwise, comparable to flowmaster 40 series) But if you dont want all the loud sound, Borla makes the Pro-Xs series mufflers in various sizes (larger muffler = More quiet exhaust)
I got my muffler and tips from ebay, no problems or anything....If you want to get the muffler at its cheapest price, i suggest ebay...
2oo1 Ford Ranger SOLD!
Proud Owner of a 2005 Silver FX4 F150