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I'm pretty sure the FP/DP are the same on the SI, but I'll defer to @PRL Motorsports to definitely answer. All parts you'll need come with the combo - gaskets, nuts bolts. I have the catless with a Magnaflow cat-back, and it sounds very beefy before the exhaust gasses get enough speed to flow...

Mine shipped today, yours should be coming up quick!

In the instance of my X, when I installed my intake fuel economy increased a few MPG. When I installed my cat-back exhaust, fuel economy went down a few MPG. I've noticed my fuel mileage being down even more since I applied the Hondata reflash. I expect the downpipe and frontpipe to slightly...

Yep, the AFR will be unaffected as its reading comes from the first sensor before the cat from what I understand.

They could go with a higher CEL cat, but the restriction would be similar to stock. The check engine light is for a catalyst inefficiency code with data obtained from the second O2 sensor. The first O2 sensor before the cat provides data for AFR I believe.

Anyone plan on wrapping their DP with a heat wrap? I'm considering it to keep radiant temps down since the OE unit has a heat shield.

That would be awesome!

I may keep mine as well and try an angled defouler with some heat wrap stuffed in it. I read a post on another forum where that kept enough gases out to keep CELs off. Or switch to the catless DP and get a K Tuner.

Dang it! I wonder if multiple defoulers or even one like this would keep it off. Not sure how much slack there is in the wiring. https://www.amazon.com/Vibrant-11619-J-Style-Restrictor-Adjustable/dp/B00AQ7972O

Awesome! That's what I was hoping to hear. Just pre-ordered mine! @PRL Motorsports - PM sent.

The goal of the v2 cat is to keep CEL's off. The first catted version DID throw a CEL after their street testing, so they are/will be testing with this new cat. Hopefully they succeed in keeping it off!

I'm looking forward to the results of your testing with the v2 cat! I want in on this!