smudaaar

I vote to remove the cat! If you feel guilty plant a tree

AO

Plant two.

hacker-pschorr

Now be nice!!
He's probably more of a 911 mechanic and doesn't know any better with the 928

When every boat, semi, moped, race car, ocean liner, and flying machine has a CAT on it, I'll start worrying about the three cars I own with free flowing exhaust that do less than (combined) 5,000 miles per year.

How funny, a car that will average 15-17mpg on a good day and we are talking about "saving the planet".

Skiviking

Get the Y pipe.....and before installing watch this episode.....lol http://www.youtube.com/watch?v=QL9O1H9e1rA POwer with intellegence!!

Mike Frye

Your mechanic has your best interest at heart, and his own as well.

Getting a Y-pipe and adding other modifications are not smart. As Andrew pointed out they may in fact be technically illegal.

They are fun as hell though.

If you plan to do these modifications but not do the work yourself, you'll have to find someone who's comfortable doing it.

morganabowen

Remember, once you make any modifications to the exhaust system, it automatically voids the manufacturer's warranty So think twice about what you are doing

Jim bailey - 928 International

Here is just one example of state law ....happens to be Ohio ..."Under state law, it is illegal to knowingly sell, lease, rent or operate a vehicle in a tampered condition. Individuals, as well as car dealerships, muffler shops and repair facilities are prohibited from tampering with a motor vehicle. This applies to all vehicles and applies to "as is" motor vehicle sales. A person who purchases, rents or leases a tampered motor vehicle may take independent legal action to get their money back on their purchase and recover damages, and in addition, if someone is known to have tampered with a vehicle emissions system, a complaint can be filed with Ohio EPA.

Ohio EPA has the authority to inspect and fine persons who knowingly violate Ohio's anti-tampering laws. Penalties for tampering violations include no less than $500 or more than $2,500 per day, per violation. There also are penalties for not allowing inspectors to perform an inspection.

More information on Ohio's anti-tampering law is available on Ohio EPA's Web site at ...." That is in addition to the Federal fine of $2,500 for the owner and $25,000 for the business who sold /installed it. The federal laws are seldom enforced , the State laws are up to the officer who happens to stop you ! Just depends on how much he dislikes Porsche drivers

hacker-pschorr

It's even worse in Colorado, Z sent this to me:

http://supraforums.com/forum/showpos...29&postcount=1

SteveG

These engines still have a warranty??

I agree w/Nicole and Morgan. Attempts to rationalize are just that. Anything you do has an effect, almost everything is a compromise, but it doesn't make sense to speed things up. The Beijing Olympics, will probably be noted mostly for the attention that is being focused on their atmosphere.

Jim bailey - 928 International

colorado fine emissions tamper ??

dr bob

I'm a big fan of making 'intelligent' improvements to the car as long as they are really intelligent. Part of the intelligent decision process includes impact on the environment, the continued maintainability of the car, plus some other issues like noise issues and the impact on the neighbors as well as the driver and passengers and your driving privilege. Hmmm, sounds complex...

-- I agree with the minority here that one needs to do their share to minimize emissions where the technology exists. To me that says leave the cats in place or replace with high-flow if higher flow is needed.

-- The continued maintainability of the car is not likely to be affected by installation of new cats behind a X or Y pipe. So long as the oxy sensor is capable and the air flow measurement is good, your mechanic won't be presented with anything that he might otherwise have to 'cure' as far as engine operation or driveability goes.

-- Noise is a red flag both for me the driver and the LEO's and other drivers who might notice the bigger sound. I've ridden in cars that just have the RMB installed and they are too loud for my taste. Ryan P rode in my car a while back, and his first comment was how quite it is. I like it that way. When driving in a brisk manner, a louder exhaust from no cats is an instant indicator to nearby officers, allowing to know by both audible and visual cues that you are accelereating too hard or driving too fast. Kind of like the idea that red cars are going faster, a loud car will also seem to be going faster. I have no need for that attention. I'm way past the adolescent stage where I need a loud car to impress the babes. My D&B rating is much more effective for that, especially since I'm a fat old grey-haired and balding guy these days.

-- Do you need the performance? I drive briskly sometimes, but seldom ask for performance that would be helped by an X or Y and no cats any better than stock a X or Y with cats could supply. I live in L.A., and there are precuious few street driving opprtunities that tax the capability of the car as it is.


Summary:

Go with the X or Y if you need/want the performance and don't mind the extra noise. Install a good cat and maintain the car to keep emissions in check.


My too sense...

Tom928

I had considered modifying my exhaust (Y-pipe with no-cats) until I learned that I can be fined, or worse my car impounded for non-compliance (tampering).
Everytime I go to DEQ they check for cats (the mirror under the car), measure the dB level and tell me to open the hood and then ask if there are modifications (do you have headers?) as they check.
A friend had new headers, with free flow cats put on his new sports car. DEQ told him he would have to remove the headers and put the stock cats back on to pass. He did, then removed the the stock exhaust and put the headers/Free-flow cats back on. About 3-4 months later he was stopped for some violation and during the stop the police decided to impound his car for suspected emissions tampering.

It's nice to have headers with y-pipe and free flow cats (or none); however, the police are making it difficult to operate a motor vehicle without factory or stock exhaust in an increasing number of states.

hacker-pschorr

Tam928,
I would be screwed with my 1990 Audi Coupe Quattro. The first 6 months or so of production they were fitted with stainless long tube headers from the factory:

928FIXER

Why is the mechanic or tech always a "moron" "stupid" or an"idiot" when he does not want to do something that is against federal law?If the epa is doing a sting by watching he and the shop owner get in trouble and pay a fine.besides,on these older cars if you have him drop the pipe right behind the cat and look inside the guts are usually......gone,empty and you can save yourself the cost of a pipe with no cats.I just get so tired of the disrespect.I don't go on line and post about doctors,lawyers,IT people or contractors.

Bill51sdr

You and Jim B. sum it up succinctly. I was once in your field and dealing with the Ca BAR is no picnic. If you want to do the Y pipe and remove the cat, you best do it on your own.