200 Cell High Flow Secondary Cats M56x

126,000 miles now bought with 63,000 miles.

Unfortunately I had to have the primary cats replaced due to being clogged and instead of replacing the secondary cats with stock I used Magnaflow Part #55995 200 Cell High Flows.

Noticeable gain in butt dyno, deeper exhaust tone (not louder) and responsiveness from the gas pedal.

I recommend replacing secondary cats with high flows……you won’t be disappointed!

No check engine light!