Kooks off road vs high flow cats

[KickerZ71]

I ended up with the high flow cats. Very satisfied with the sound and performance.

[VR Baron]

Originally Posted by pyroguy

You can't tell a difference between high flow cats and stock cats? Maybe it's just a V8 thing, but I'm absolutely floored that you couldn't tell a difference. Update us after going back stock and let us know if you'd just gotten used to the difference or if there really wasn't anything different in your experience.

Maybe hard to tell for some. A friend had to take off his longtubes for smog. Other then loss of bottom end was hard to notice the 25 hp on top.
As to power, JDP did a before and after dyno with my car. Hiflows got a maximum of 15 whp. A peak to peak of 12. Max peak tq was 9.5

[pyroguy]

Originally Posted by VR Baron

Maybe hard to tell for some. A friend had to take off his longtubes for smog. Other then loss of bottom end was hard to notice the 25 hp on top.
As to power, JDP did a before and after dyno with my car. Hiflows got a maximum of 15 whp. A peak to peak of 12. Max peak tq was 9.5

Very interesting results. Thanks for sharing.