Drilling Holes in CAT

[Daniel Park 2]

One of my friends have drilled holes in his cats on his wrangler to make it louder and it is.

I wanted to know if it was safe to drill holes in the ST cats. and which cats should I drill holes in IF it is safe to do. I do not care for emissions because i'm getting high flow cats soon but not that soon. should I drill holes in the cats or the pre-cats?

 

[EddieS'04]

Driling holes in the housing, will just cause exhaust leaks....drilling through the catylyst brick may cause it to loosen up and start rattling...eventually it will come apart and plug the exhaust...

 

[Ben Poche]

i would not drill holes in a cat on the ST it may be messy and might scratch the paint:lol:

 

[Daniel Park 2]

... :huh:

 

[Deleted deleted]

Drilling holes in the cat could allow carbon monoxide to seep into the cabin of the truck and pose a health risk. In addition, your vehicle would no longer pass a state safety inspection, and who's to say 'louder' is actually better?

 

[Daniel Park 2]

I like it louder but deceded not to drill holes in the cat. too scared lol.

 

[Wes Davis]

Yeah, you can do anything you want. But that doesn't make it a good idea. LOL I would just cut the pipes at the headers and stick on a couple cherry bombs.

 

[Tracn Black]

that is just being a hillbilly!!!!

 

[George C]

I have heard of people hollowing out the cat but never drilling holes into it. Like the others said you don't want the exhaust leaking into the passenger cabin.



George

 

[Jeff C]

Exhaust leaks are fun... I used to have a cutout, but my dad kept bugging me it could get in the cab, so I got it dumped out the side. Get a Hi-Flow Y-pipe and remove the muffler, and you'll have all the loud you want, and then some...Just ask the Louisville attendees :lol:

 

[Chet 02]

Jeff...Yep. They're loud that way....[Broken External Image]:



Chet

 

[Ben Poche]

had cut outs on my 66 mustang dam loud just bad a** at night when you say the blue flames under the car

[Broken External Image]:

 

[Mike Valvardi]

The cat will cry and flail around at first, but a warm fuzzy feeling will follow, and it will eventually die.