PS41Family

Swapped catted headers from ARH to PHADT. Did the install myself with no installation issues. I started the car after the swap for a few minutes and heard no leaks, no codes and then turned it off.

After my first real test drive since installing the headers, the car displayed the code pictured below. It kind of lacks power under 3k but then is fine. The car feels under 3k almost as if it is missing a bit and a bit underpowered. It also feels almost like a bad or disconnected spark plug wire but not to that extent that one really is (checked them).

Could it be I need a new tune since I just switched headers from ARH to PHADT?

I also see a hairline fracture on the air bridge coupler. Could that be it?

I put in the same O2 sensors as before.

Thanks for the help.

PS41Family

I forgot to mention I also have a Beehive intake and Vette-Air shroud.

SteveDoten@ARH

It will lack power after the swap for sure.

Mike@DiabloSport

Cracked air bridge would generally lead to p0171 and p0174 for both banks. My best guess is that you have a small exhaust leak at the passenger side collector drawing in fresh air, washing out the O2 signal, and leading to the false lean condition.

PS41Family

So then Bank 2 s the passenger side? I was assuming it was a driver side. Mike, would you also think I need a retune due to the swapping of the headers? I went from ARH to Phadt Tri-Ys both 1 7/8" and both with catted mid-pipes. I believe you are correct Mike, would this also result in reduced power due to slight hesitation (no buckling) at lower rpms?

After idling the car for about ten minutes I can hear something from there. That's why the drivability issue is intermittent. And I believe that also explains why the engine light takes about 20 minutes to turn on after driving the car each time. Thanks.

Mike@DiabloSport

Yes, bank 2 is passenger side.

C7/Z06 Man

There have been endless discussions on here about which "style" i.e. 4 into 1 or the 4/2/1 (Phadt) headers make the most HP. I came away with the 4 into 1 style as making the most and the 1 3/4" dia. at that; unless the rear wheel hp gets well over 700 hp than go 1 7/8".

After your results so far (less power under 3,000 rpm; the other guy is already in front) I would go back to the ARH "4 into 1" and sell the Phadts, after all when you install headers you are looking for the most hp? That is what I would do.

PS: If you want to make some kind of change than get the ARH headers coated, helps to keep the exhaust gas flow up which "may" lead to a little extra hp but if nothing else it will keep the heat down more in the engine compartment and give them that "new" look again.