are X-Pipe Crossover Pipe really worth it ?

[spiffcheese]

Does anyone know if X-Pipe Crossover Pipe really make a difference in the power of the car?

http://www.928motorsports.com/parts/xpipe.php clams that they add 26 Hp but i am having a hard time believing that does anyone have any insight on this

[BB500]

I read that too, maybe a full system might add that much.....

[spiffcheese]

ya i just dont want to spend $500 on something that just makes my car sound good i want it to work

[Danglerb]

When I switched from factory H pipe and cats on my Mustang to an X and modern cats the tires started breaking loose in first and second when I hit about 4000 rpm. Some of that was cats, some was the X, but the X on a Mustang due to the tranny being right behind the motor isn't at an optimal location like you can get with a 928.

I've got a locally made Y on my 85 Euro, and plan on giving a shot at improving it.

[Danglerb]

Trouble you may have Spliffc is that Ca regulation on muffler shops got WAY stricter this past January, so it may be hard to get any shop to touch the cat forward area. As I understand it all the universal cat exceptions have been tossed out, and EPA now want only factory or approved factory equivalent direct replacement parts going on (bolted to bolted no welded).

One local shop that used to do 928 exhausts flat out said not touching them until the EPA rulings are more sorted out.

[MPDano]

It's good to live so close to Mexico. I can get ANYTHING done in TJ.

Also, what the heck is a "bolted to bolted no welded?"

[devilinblack]

Not a problem if you can run a wirefeed welder!

[Danglerb]

Originally Posted by MPDano

It's good to live so close to Mexico. I can get ANYTHING done in TJ.

Also, what the heck is a "bolted to bolted no welded?"

EPA appears to want the catalytic converter assembly including headpipes up to the manifolds to be replaced as a unit, and that unit to be specifically approved for the vehicle with a CARB EO#.

According to some of the muffler guys the situation is a mess and in the process of being revised.

Up until January cats could be "universal" so a single model fit essentially everything from a Honda to a Corvette. Now the CARB EO# must be vehicle specific, which I think means tested on each vehicle model. Also the cats have to have a 50k mile warranty.

[spiffcheese]

thank you for the info i dont have a problum with the EPA i can put them in my self no problum

i just dont no how to do the cats and i cant get anyone that is not the dealer to even look at my car let a lone put on new parts on it

[MPDano]

Originally Posted by Danglerb

EPA appears to want the catalytic converter assembly including headpipes up to the manifolds to be replaced as a unit, and that unit to be specifically approved for the vehicle with a CARB EO#.

According to some of the muffler guys the situation is a mess and in the process of being revised.

Up until January cats could be "universal" so a single model fit essentially everything from a Honda to a Corvette. Now the CARB EO# must be vehicle specific, which I think means tested on each vehicle model. Also the cats have to have a 50k mile warranty.

Yup, this is correct as this is why I bought a Magnaflow Cat with numbers/letters on the bottom. They checked when I smogged.

Here is my Cat specific to my MY 928.

[spiffcheese]

how much did that set u back and do you think as well as the x Pipe that getting cats is worth it or should i look for a different system ?

[Danglerb]

Originally Posted by spiffcheese

thank you for the info i dont have a problum with the EPA i can put them in my self no problum

i just dont no how to do the cats and i cant get anyone that is not the dealer to even look at my car let a lone put on new parts on it

What part of Calif? (note my sig for SoCal resources).

As I understand it, vendors won't sell to a Calif resident or address, except for items in the "Calif" catalog, and that only lists the vehicle specific cats, not the neat new high flow type cats.

My impression is also that "things" still slip through smog inspections about as well or easily as ever, but the muffler shops are not taking any chances.

YMMV, roll the dice and see what happens, etc etc.

[Craig S.]

check out performance928.com

Louis Ott makes the best X Pipe.
I suppose what comes out of the tail pipe (passes smog test) doesn't matter to the regulators. We need to get goverment out of our lives. How many in California looking at this blog voted today?

[Danglerb]

3x 8 no votes here.

[spiffcheese]

thank you for the info

i did not really think about smog tests my car passed last time no prob but idk about with a new system well in like 10 more years i want have to do smog

[spiffcheese]

oh north cal just north of Sf where everyone is all "green" about there cars i get some bad looks sometime when i drive partly because my car is not "green" and partly because people think i am too young to have a 928

[2Quick4u928]

Hey, what's up....check this site out;

http://www.ritech-systems.com/928/_X__Pipes/_x__pipes.html [/URL]

In the U.K., the system has been well versed out and are made there also. Seems for the most part, the guys pass the UK MOT with this system & CATs. Also in the UK, believe it is much strictor than in CA as one can get an automated ticket just driving downtown and your carbon footprint is over the standards set, and this is caught with the new "Carbon Camera's" mounted over the highways.

Normal "Cat" test in the UK for a non-cat 91GT are 3.5% carbon monoxide (CO) and 1200 ppm Hydrocarbon (HC), go figure hehe. As long as your car can meet the emissions figures in the UK then all is ok, if not then guess what...time to invest again. HOwever in the great US of A, everyone is required to cross their "T's" and dot their I's.

"With Cat" test is (From a forum last May):

Fast idle (2,500 - 3,000 rpm) CO <= 0.2 HC <=200ppm 0.97 <= Lambda <=
1.03

Normal idle (450 - 1,500 rpm) CO <= 0.3

95GTS Auto (M28/50) the figures are:

Fast Idle Test:
CO: Limit 0.3 %vol
HC: Limit 200 ppm
Lambda: Limit 0.95-1.5

Natural Idle Test:
CO: Limit 0.5 %vol

The idle CO for LH models with cats up to '86 is 0.4 -0.8% (before the
cats).
This implies that it should be possible to get a smooth idle with 0.5%.
However, if you are running with an oxygen sensor, you can't adjust it
manually. It may by OK, but if not, you may have to add the adjuster pot
and change the coding plug in order to make it adjustable.

The rules specifically are
Car first used between 1/8/86 and 31/7/92 the test limit is the CO< 3.5% etc
Car first used after 1/8/92 the test limit is the CO< 0.3% etc

One guy has a 92' GTS non-cat with X-pipes and passed the test within the guidelines, however we are comparing apples to oranges in regards to CA vs. UK. Is a bit confusing but the later is a bit better to understand.

Would be interesting to see this figures for CA on the same model & year in comparrison to the UK, anyone?....Hope this helps a bit.

[MGW-Fla]

I've installed an Xpipe & removed the cats on two '85s and my seat of the pants meter definitely says it made a difference in both cars, besides making them sound better too.

[spiffcheese]

thanks that all helps a lot you have no idea i feel that if i do get x pipes that i can pass and if not just take them off and try for round 2

the x pipes i was looking at you dont have to take of the cats or maybe i am wrong anyway thank you all so much that was really a big help

[Danglerb]

Check out Red's experience with high flow cats.

http://forums.rennlist.com/rennforums/928-forum/494562-dumb-founded-failed-smog-test.html