Cat Delete Test Pipes

[subl1minal]

I was wondering while I had my truck up on the lift in my garage this morning.... has anyone had a set of cat delete test pipes welded up for off-road use? just wondering if the cats are even that restrictive, and if it would do anything besides just sounding better. Any ideas?

[GORILLA]

hi ,what i have heard our tundra cat's are almost like performence cat's. if you were to buy a new set of performence cat's, they will not gain you much if any at all.
but any kind of exhaust that isn't a straight pipe will have some restriction.
that is why in calf. there is a 3rd cat, & due to that 3rd cat there HP is 5HP less than every other state. so now i'm assuming that each cat reduce's 5hp.

the only way to gain, is to use straight pipes and have the o2 senors skrewed directly into the straight pipe. it will work, & can be done, because it was done.
and
it will not through any cell or any codes, just as long as you reconnect both o2 senors into the straight pipe's.

this will gain you a total of about 10 more HP.
5hp per cat.

off road use only! for all you fed's out there, that know all the rules & regulation's!LOL

if your state doesn't do emissions testing, you are good to go.
have all the fun you want off roading.
there is a member here that has a older tundra that has all the mod's done including this 1.
try it, juct make the cut's perfect so in case you need to put them back on, it isn't a hack job. all you need to do ,is go to any exhaust shop with a measurement, and tell them to spread the end's to whatever you need them to be ,so you can slip them over the end's.
good luck,
gorilla

[bill3508]

You normally gain 2 to 3 hp going catless.

[Mr. Creosote]

I would go with 10-15.

[subl1minal]

i really want to do this now.... i'm going to the exhaust shop after work to get a quote lol.


if nothing else, i just want the sound for when i open up my cutout should sound less like a boat and more like my Brodix-powered camaro hahaha

[escondidotundra]

you need to install a o2 sensor simulator if you remove the cats. The back set of o2 sensors are only there to tell the computer if your cats are there and in good working order. I took my cats off and haven't installed the sims yet. The cel came on after about half a tank of gas. There sure is a noticeable throttle response and throatier sound.

[nytrousboy]

Weather your State does Emissions testing or not it is 100% Illegal to remove your catalytic converter per the Federal Government (EPA/ARB) Clean air act 1990.

The catalytic converter plays a major role in the emissions reduction of a motor vehicle. The vehicle manufacturer has matched a specific catalytic converter to the vehicle to minimize emissions output. Both CARB and the EPA do not allow the replacement of a catalytic converter with non-exempt "high flow" performance replacement unit. In fact, it is technically not legal to even replace a converter unless it has been proven by technician to have failed, and then it can only be replaced with an exempt OEM equivalent unit. (However, enforcement of this requirement is difficult and is the primary loop-hole that allows the usage of so-called "high flow" catalytic converters. Many of these units are sold with the disclaimer as being a "race" component and are not intended for street use.) Due to the hundreds of vehicle models produced over the years, it is virtually impossible to determine by glancing under a car whether the converter is the original unit, a legal OEM replacement, or a non-legal aftermarket "high flow" performance unit.

now will you get caught? that all depends, the EPA does have mobile enforcement and some law enforcement will check for equipment.

[GORILLA]

hi, i highly doubt you will ever get cought. the gain's will be there.
what the guy did, was he put plate's covering where the cats went.
so no one could get a look. if he /she was ever stopped the plate's covered it completely,
and he/she said to law enforcement it was to protect over 3g's in cat's,
due to the article's in the new's paper's all over the united states.
so legal or not, this is what many people are doing so there cost,
of new cats wouldn't be a issue if stolen. so in conclusion,
legal -no it isn't, gain's for sure, and protection from theft o've course.
there in your garage. LOL

we all know the law's.
florida just passed several motorcycle law's.
just wait till you see how many rider's die in florida this year & in year's to come,
do to motorcycles vehicle's being singled out.
even a 1000 fine for a side positioned license plate. what BS!
and if you go over 30 mph over the limit, in a car you get a ticket,
on a bike you get arrested, impounded bike,
and huge fines up to 5g's, & 1 year without a license.

so i imagine many will run, & honestly i don't blame any of them.
this is just like the BLS breed specific legislation.
blaming the breed not the owner.
every year i have to get new homeowner's insurence due to:
the fact that they know what breed of dog's i own.
i am 1 of the most responsible owner out there.
4 vet's, all med's, everything they need.
my dog just won 2009 stage dog of the year.
but yet he is on that BSL list.

now back to the subject, there are more thing's to worry about,
like all race track's, company's producing dark smoke, when it should be white.
several vehicle's don't add as much as what is dumped into our ocean's.

the gov. should be more concerned with serious issue's than this 1.
my .02cent's- wrong or right.
gorilla

[nytrousboy]

I cannot agree more, however working for The Department of Environmental Quality and dealing with the EPA on a day to day basis just wait too see what will be coming out soon to us auto drivers, they make so much money hitting (us) than the big industries it not funny..right or wrong it is what it is...sad we have to pay the price....

However most newer car wont see much if any gain in removing your cats..(in some cases it may hurt the vehicle performance) we deal with this every day and the gains are not worth the trouble.

[GORILLA]

hi the member that deleted his cat's, stated his gains , throttle response and power & torque was like night & day. i know many of you like to see proof, before you ever make a decision. i truely understand that. it could go wrong, costing you more than it's worth.
but he said it was worth it in every way.

now we all know there has been many case's here of fraud, lie's etc, many negitive BS. the only true way to tell is for someone trust worthy to do it.

as far as someone doing a dyno before & after, as we all know in today's time's will not happen.

that is why i have tried to prove everything i did. i also proved that adding the mod's did add more power than what many said. such as if you add a cai, headers, cat back exhaust, unichip you just don't add up the assumed gain's and that will be your #. well that went out the door when i proved it was possible.
and now with the 2nd dyno i gained even more on map B of the UNICHIP.

so sometime's not everyone who post's here really & truely know's, the real deal.

there are some really great people here, but there are also people here that just love to discredit everything.

i was 1 that have in the past get upset & get into it with some. but thats over & done with.
at least i have tried my best not to.

if i was going that root, i would do it, but i'm not. i would & might be interested in this in the future, but not now.

if i was this member, & he had the flow to dyno before than after we might have a better idea.
all i know is the fact's written by the calf. state law and by adding the 3rd cat the tundra lost 5HP.
so i am assuming and sometime's by assuming you make a a$$ out of yourself. but i feel pretty confident that by removing the cat's a gain will be there.
but only time will tell, when a member does this mod, right or wrong.
o've course for off road use only.
gorilla

[bill3508]

Most GTO owners only gain 3-5 HP deleting cats. There will not really be much of a difference in throttle response or torque. Assuming that this "member" who did this mod greatly improved throttle response/torque, you could also assume that the cats are more restrictive, but unlikely. As stated you also need the sims or else you will throw emission codes, which won't hurt anything, but will make you fail emissions, but cutting the cats out will do that anyway. Deleting the cats does make it louder, at least it has on the vehicle's I've done it on and it also tends to increase the raspiness of the exhaust and popping on deceleration.