Cutout before cats?

[BRAPPPP]

gotcha

---------- Post added at 09:40 PM ---------- Previous post was at 09:11 PM ----------

Yea it should. No inspections in FL so they won't be going on any time soon. X pipe equalizes the back pressure and resonance between each side of cylinders. Y pipe just brings them together and doesn't flow smoothly. X pipe also sounds the best and lest the gases escape the best. I know I didn't do a great job with the explanation sorry about that.

Sent from my DROID RAZR HD using Tapatalk

Did you find a good deal on the headers? Stainless has the best prices I've seen

 

[r6cairo]

Wouldn't you lose performance if you place it before the cats due to a loss of back pressure?

 

[Captain Awesome]

You don't want Back pressure you want your exhaust to act like a vacuum and pull exhaust gases out. here is a really good article on the Myth of Back Pressure.

exhaustbackpressure

 

[Wilson]

hears an idea of that it will sound like with out cats but I have the s-type SW mufflers.
https://www.youtube.com/watch?v=fYPFHVY-QT4

 

[Cleave]

There is a purpose to back pressure, a lot of high revving high compression ratio engines have the tolerances so tight that back pressure is the only thing that prevents piston to head contact at redline, our engines are mid revving mid compression ratio engines, the minimum back pressure and maximum velocity we can run the better, but bypassing the cats can reduce velocity, especially with the use of cutouts to do it, cats produce very large amounts of heat in the exhaust, heat creates velocity in the exhaust system, this is why headers usually produce more power than manifolds (although that's not the only reason headers produce more power) and header wraps improve performance, they both hold heat inside the exhaust system better instead of letting it escape to the environment, cutouts create a sharp 90 degree change in exhaust flow direction which kills velocity, for maximum performance bypassing the cats with cutouts probably isn't the best option out there

 

[Wilson]

this is funny
https://www.youtube.com/watch?v=mvbQM7GEr24

 

[JJ f150harley]

Yea I got a great deal through Chris at freedom motorsports. He had an October sale and I got a a few other things all at good deals. I spent way more than I was planning but trucks and boats are the same. Bring on another 1000

Sent from my DROID RAZR HD using Tapatalk

 

[JJ f150harley]

Cleave great write up. So I learned why to wrap the headers and it makes total sense now. Wilson ur truck sounds awesome.

Sent from my DROID RAZR HD using Tapatalk

 

[BRAPPPP]

dammit guys well i live in CA and have to either put the cats back on in a couple years or work with em

 

[Wilson]

try e-30 I know everyone hate's it