I am considering putting in the PPE High-flow cat (HAC) for the PPE Header.. please provide feedback on:

1. Sound - I love the current sound of the header.. installing the HAC how much different in quality and loudness?

2. Power - how much torque/horse power will be lost?

 

I added HFCs and the sound is cleaner and you lose about 1-2hp, nothing you will notice though. I'd say it is a good move if you want a smoother sound!

 

I myself went with the HFC with the PPE. Yet to install it yet till spring been still in my living room for the past 6months

 

I got it catless and love it! Sound might be loud but to me it's not that loud at all. A bit raspy but everyone has always told me it sounds really good.

 

I've ordered the CAT... I would prefer not to.. but this seems the only other solution I can think to solve my CEL problem.

 

Still battling with the CEL huh? That Sux. Maybe it's just too cold and the CEL will go off in the Spring???

 

Well.. I fixed the O2 sensor signal problem with the O2 simulators.. but the O2 heater wire information keeps failing on my driver side. I had 2 O2 sensors heater failed on the driver side... I just hope putting in the CAT will solve the problem..

 

I got mine without the cats just t see how it would sound. I figured maybe latter on ill install the HF cats. HOWEVER after installing them I dont think I want the HF cats anymore, the car just doesnt sound like an IS350, it sounds faster, and normal driving its honestly exactly the same as when I only had the Tanabe and megan midpipe

 

After installing the HF cat how did it sounds.. how much noise was loss.. was there noticeable power decrease? How was it installed?