Looking for a 2009 2.2L NA Cobalt 2LT Automatic downpipe.

a) What is the difference between ZZ-E25DP-AC4 and ZZ-E25DP-AC4-CUSTOM ? I would think the latter but the former does not say it doesn't work with 2.2L and there is a price difference.
a. ZZ-E25DP-AC4: ZZPerformance - 2.5 inch Stainless Cobalt/Ion Downpipe #ZZ-E25DP
b. ZZ-E25DP-AC4-CUSTOM : ZZPerformance - 2.5 inch Stainless 2.2L Downpipe #ZZ-E25DP-22

b) Whichever one it is, does it have two O2 sensor bungs like the stock downpipe (one before and one after the CAT)?

 

Update.
I ordered the ZZP downpipe eventually: ZZ-E25DP-AC4-CUSTOM : ZZPerformance - 2.5 inch Stainless 2.2L Downpipe #ZZ-E25DP-22




Deeper sound. Rest of the exhaust is stock. Nothing bad. And also no CELs after a week of driving. Good stuff.

I have ordered it sooner if I had noticed the extra information on the 2.2L pipe page at the bottom. So after finding that info I took a little bit of a risk and put a confirmation request in the comment section when I placed the order. Glad it worked out. Just wish I could have synched up with ZZP to confirm the details the couple times I played voicemail tag with them and several times I sent emails and replied to the auto-responder to still get no human response.

But anyway, looks like a GOOD product so far. Fast shipping. Thank you.