Cat went bad but have hiflow and straight pipe which route shall i take?

[p10socal]

My Hiflow cat is rattling. I have both a new hiflow cat and a straight pipe. I read an article that straight pipe loses power on the dyno. But i dont remember if it was a straight pipe or a gutted cat that was tested.

Pic of my straight pipe. cat look a like ....OR Will this do just fine?

[THOR]

use the high flow cat

[p10socal]

Thanks for the guidance. I think if anything maybe minimal gain at the top but overall power loss through out with the straight pipe.

[Dudeman258]

Damn that car looks good. Use the high flow cat, love the flowers.

Dudeman

[SGTSR20]

A bit off topic but since you posted a picture of your whole car,

from what car is that lip coming from?

I got same side skirts you have but without a lip the car look empty in the front.

[ca18 bluebird]

power will be in this order

straight pipe
good high flow
gutted

straight pipe is the best for making power simple.

A good high flow cat can out perform a gutted cat because most good high flows (like metal cat) have a far wack of r&d in baffle and flow design. Where as a gutted is crap because it will open up in the middle of the cat and then the air is forced back into a 3 inch ( or 2.5) pipe at bad angles making the air fight to get back into the pipe.

you could always try both and decide

[BenFenner]

Straight pipe will make most power always and forever.

High flow cat versus gutted cat is a crap shoot. If it's gutted well it will flow as well as a straight pipe. If it is gutted poorly it can flow worse than a high flow cat.
The thing in your hand in the pics looks like a very well gutted cat.

[ca18 bluebird]

Originally Posted by BenFenner

Straight pipe will make most power always and forever.

High flow cat versus gutted cat is a crap shoot. If it's gutted well it will flow as well as a straight pipe. If it is gutted poorly it can flow worse than a high flow cat.
The thing in your hand in the pics looks like a very well gutted cat.

well it all comes down to what you consider a gutted cat. to me a gutted item is just attacking the baffles with a broom. However is you consider welding in a pipe through the midle a "well designed gutted" then yeah i agree with you

[daveracer]

Yes a gutted cat is the worst out of the three. And yes, the straight pipe will make the most power.

[cory]

its earth day.. use the cat.
lol jk straight pipe all the way

[p10socal]

So the Cat that im holding will that qualify as a good power maker? Looks like a straight pipe?


Lip from VW mk3

[Teal97]

i vote use the new high flow cat, and i'll tell you why

1st. your car will sound like ass when you hit the big lobes with a straight pipe. at least put another resonator in its place.
2nd. at your hp levels, highly doubtful the ass dyno can feel the minimal power loss of a good cat over the straight pipe.
food for thought....my 12 yr old, 212k mile oem nissan cat, was flow benched to flow within ~15cu.ft./min. (or 5%) compared to a brand new 3"in/out highflow magnaflow universal cat.
3rd. earth day lasts all yr,..................................... for all of us.
do what YOU think IS RIGHT.

btw, nice "G"

[morgans432]

straight 3" is where its at

[Teal97]

whoops

[Coheed]

Hmmm interesting. My cat has completely dissintegrated. I didn't even have to gut it. It's, just....gone.