scidav87

iTrader: (16)

I just installed 2 3" cats on my true dual set-up to be legal, make the car smell alot less and be quiter for my kids (and wife). I was courious if anyone has knowledge as to how much HP you actaully loose. The car has a cam similar to the MS3, heads, FAST 90, etc. THANKS! Car makes 441RWHP with the old ORY setup BTW...

SOMbitch

iTrader: (8)

With GOOD flowing cats 5-7 at your HP level.....

SweetS10V8

iTrader: (4)

I did a test on a 500hp 6.0L and it only lost 4hp with Dynatech cats

blown03mustang

with cats your in the 43xs with no problems....you shouldnt have lost more than 5hp or so

maxspeed96ct

iTrader: (3)

Im going to be ditching my cats off my kooks in the next week or two.

From what ive noticed with a healthy cam you loose 5-10 with cats. but I guess it depends on the cats aswell.



How bad was the smell? or are you going catted mostly because of noise ??

scidav87

iTrader: (16)

The smell was just normal "lawnmower" smelling exhaust. I have a 2 yr old thats in the car with me rather often and another child on the way, so i wanted it to be more family friendly. The sound is for sure a bit deeper with them, and the exhaust smells like a new car would, that goofy "cat" smell. I used normal ceramic stainless steel cats, 400 holes per inch. I have no CFM data on them.

camz28arro

iTrader: (12)

Two 3" high flow cats would hardly restrict that motor, most likely 5hp or less. Plus, like you said, you get a better sounding exhaust tone and get to be "legal".

tom falco

At 200 cells on a 1000 HP chevy motor we lost 10 HP. On a 500 HP LS motor we lost nothing. Cats are not what they used to be. They came a long way from the old ones. I use them on all my builds and dont run any mufflers. You loose more HP with mufflers than with cats.

bayer-z28

iTrader: (14)

You may loose a couple of horses up top, but adding cats should give you a little more low RPM grunt again, though. Helps the TQ #'s a little, IIRC. When I took my cats off it felt like I lost a hair bit of low end.

Brandon35thSS

if my car lost any power by adding cats,the seat of the pants dyno cant tell!