My flex pipe on my headers is making a nasty *** rattling noise. I can get a cheap one off ebay but I need to know what the end diameters are so i can get the right one. Also if you know the stock length also that would be great. And no I dont want a new BLING exhuast, I just want to return it back to stock so I can sell it.

 

For all Prelude VTEC's it is 2.0'' .

 

It's more variable than that. It goes down to less than 2 inches before the cat, and after the cat it's somewhat wider.

I'd suggest just going to a muffler shop, their prices on a single flex pipe & install shouldn't be outrageous by any means.