I was wondering if you see any gains by adding hi flow cats. I have the Silver Bullet exhaust. I didn't want to get headers untill after i got a built motor ,whenever that may be.

 

Here is a little info:

https://www.f150online.com/forums/sh...low+pipes+cats

Do another search and you might find more.......?

Dan

 

No gains reported in that post.

 

Sure will sound a lot better

--Joe

 

Tim: I couldn't find the thread I thought I remembered as to showing gains............. That's why I worded my post the way I did.

Dan

 

You will for sure see an increase in the loudness of your exhaust. I have the Silver Bullet catback with high-flows and it sounds awesome but is right on the boader of being too loud.

 

so basically i could gain the samething by gutting the cats?

 

Just get 02 simulators and get rid of the cats all together....

 

I won't beable to pass inspection then. anything wrong with gutting the cats?

edit: what is am o2 simulator. im doing a search.

btw, thanx for the replys.

 

alright. what would guys do? i don't want to spend the money if you can accomplish the samething by doing something else. I want an increase in performance and sound.

 

I gutted my high low cats and removed the rear O2 sensors. I passed emmisions last week no problems. All they did was check under the truck with a mirror to see the cats and connect to the OBDII port. No codes so I passed.
BTW, I had straight pipes with the stock manifolds and dual cats a couple of years ago. The JDM headers, gutted cats, and silver bullet exhaust I have now is louder than the straight pipes which were pretty loud.

 

Leonards sig

--Joe