Cat

[RodH]

anyone run a vs 3.8 without a cat ? cheers

 

[losh1971]

Why would you want too?

 

[Ginger Beer]

Why would you want too?

Why is easy

A bit more noise
Lower temps
Increased flow
A couple of HP when tuned to suit

The hard bit is if you should

Street car = no
Race car = yes

As the OP has asked about a 6 cylinder, I would say a hard no.

anyone run a vs 3.8 without a cat ? cheers

 

[losh1971]

Well if it needs a tune to suit and gains would little on a V6 anyway, unless it had a fair bit of engine work. My question remains, why? I have gutted cats before and in pedal feel, it made no difference on a straight six with similar HP to a standard Eco.

 

[Ginger Beer]

Well if it needs a tune to suit and gains would little on a V6 anyway, unless it had a fair bit of engine work. My question remains, why? I have gutted cats before and in pedal feel, it made no difference on a straight six with similar HP to a standard Eco.

You can pick up a nice little chunk of power everywhere with just a tune, without a tune it is pointless.

You also run the risk of being hit for emissions, but, where a punched out OEM will pass a visual inspection, a decat pipe can see a very nasty fine.

In saying that, the stench of hydrocarbons coming out the rear is a dead give away that a cat has seen a hammer and long screwdriver.

As for high flow cats, when I was getting my car engineered I needed to install 2 OEM cats IOT pass, even when we tried to tune to pass the 100 cell failed as did the 200 cel.

Emmisions are hard,E85 does help to pass though.

 

[gtrboyy]

Put it this way can get fined a few grand no having a catalytic convertor or go 100cell metal cat replacement might only get $100-$200 fine or yellow sticker & have to put stock ceramic back on to pass.