SouthernRex

Sometime in the next year I'm going to be getting Long Tube Headers installed, and I was thinking about just deleting the catalytic converter all together because I don't live in a state with inspections.

At some point it dawned me that my wife and I might move out of state in the future, and I would need to pass inspection. Of course I want as much power and dB as possible, but is there a huge difference between the high flowing cats and not having one?

HCI2000SS

iTrader: (2)

With a basic build there is almost no power difference between good high flow cats and none

SouthernRex

Ah, so I wouldn't really benefit from no-cat without a psycho cam or blower?

HCI2000SS

iTrader: (2)

Yeah basically lol. I mean you might gain like 3 hp up top at the cost of 3 hp down low or something like that, but it's gonna be so small I'm not even sure you could accurately document it on a dyno

ULTIMATEORANGESS

iTrader: (4)

i gained 7/7 on my H/C/I after i gutted my cats and got retuned.


and they were high flows.

HCI2000SS

iTrader: (2)

Same dyno, same temps, same tuner, same exact mods, etc...?

ULTIMATEORANGESS

iTrader: (4)

dyno yes,temps yes,it was dynoed maybe a month earlier though its been awhile. same tuner of course lol. and no other mods were added at that time.''


i know my cats got clogged due to a **** tune and it was dynoed shortly before they took a **** so i just had them gutted.

HCI2000SS

iTrader: (2)

Gotcha. I've seen anywhere from 0 to 5 hp in general, but there are always exceptions no doubt

ULTIMATEORANGESS

iTrader: (4)

it was also on a mustang dyno.

MonmouthCtyLS7

iTrader: (6)

If you don't need them don't run them.

SouthernRex

If I gut it, but keep the shell... and tune out the post-cat o2, would I be good for inspections?

I've never lived in a state that requires it, so I have no idea how that stuff works.

Aaron at SDPC

Really depends on who is inspecting it, but I wouldn't expect it to be too much of an issue.

RPM WS6

iTrader: (3)

I agree. If you don't need them, then there's no reason to spend more money for something that will cost power and complicate the exhaust system unnecessarily.

Also agreed. Just because a state has inspections doesn't necessarily mean that you need cats to pass. If there is no visual and no sniff (like my state), and all you have to pass is an OBD scan test, then tuning can easily take care of this. So yes, it's all dependent on the state/test process. Also, some states only test within certain counties or ZIP codes, so even if you're in a test state you may or may not have inspections depending on your address.

ULTIMATEORANGESS

iTrader: (4)

all i can say is my tuner got a legit sticker for mine so i doubt they checked for anything but codes.