Is anyone using this y pipe with the cats built into it?
I have heard it is the way to go when doing an LT1 ODB II swap but at $600.00 I wanted some fist hand info or some sugestions. My set up is from a 96'. I have to be smog leagal. I have been told that there is a 25 HP gain over using the single cat. Anyone heard of this?
I was thinging of using shorty LT1 headers with the stock 96-97 dual cat y pipe.

 

You can run a typical exhaust for your LT1 swap. I would use a single 3" cat and 3" cat back attached to regular 3rd gen headers of your choice. There isn't really a need for dual cats when a high flow 3" will be more than enough. Not to mention it is tons cheaper.

 

OH man that would be nice as I actually have a full custom exhaust with a high flow 3" single cat with only 1k miles on it, but it is set up from when I had the TPI in the car and I don't know how to work out the AIR intake issues as the LT1 I have now has and electric air pump that only runs for the first minute upon start up and is only plumed into the exhaust manifolds, where the cat I have requirs constant or at least intermintet air during operation to work properly and the air is fed directly into the cat. Or at least this is how I understand it to work. Someone must have worked this out before but search I tried didn't turn anyting up.

 

You can delete the AIR system on an LT1 just like any 3rd gen. Check out and search on camaroz28.com and you will find out how. The LT1 is a tradiationaly Small Block on the outisde so everything from your old exhaust will work fine.