Downey header exhaust routing

What's up guys. I managed to get my hands on a set of Downey long tube headers. With where each banks collectors start, I won't be able to use the stock Y pipe. I've toyed with the idea of dual exhaust and keeping the stock components for emissions time, but figured that may be a pain in the ass to do every two years. My other idea is to try and make my own Y pipe and route it below the tranny and have everything still route through the cats and muffler. Anyone have experience with this?

 

Dont the long tubes delete the front cats?
Meaning ur gunna be swapping alot erry 2 yrs anyhow?

 

I also heard they do have a ypipe, but some ppl had issues with certain yrs

 

From what I understood there was only the two after the Y pipe collector

 

Well that would be nice

 

Either way, I would have to make a crossover that either goes under the transmission, or recreate the stock crossover with a bit of modifying of it

 

Link to these headers?

 

https://www.tacomaworld.com/threads/downey-3-4l-long-tube-headers-and-40”-radial-c.525034/

Best I can find. These are the ones I bought. Downey went out of business a while ago.

Edit: they went out in 2009 actually