Hello,

What's good with the JWT kit. Just curious. HFC's or donw pipes for most power and least smell/sound?

tia.

 

I have the UTR test pipes with mine, not loud at all. The spool up is about 300RPM's faster with them then the stock cats. You will have a fuel smell though, but that is just how it goes.

 

i picked up a duel 2.5" exhaust with metallic 300 cell HFC from FastIntentions in preparation for going with the JWT TT kit at the end of the year...

www.fastintentions.com - give Tony a call - top quality, great customer service - some reviews over at g35driver.com

 

With the turbos I would only consider test pipes. Look into a normal 2.5" set, or I beleive the big 3.5" APS pipes will work with the JWT kit. I would go with the big pipes if they fit. Paired with a decent exhaust like a greddy TT, APS 2.5", or something similar, your exhaust note will be very controlled. You exhaust smell will be a little more noticable, but if you car is properly tuned, this isn't something to be concerned about.

Just remember, your turbos want free flow when it comes to exhaust and putting a set of cats, even HFC, is not optimal

 

Thanks all for the help.

 

It is a poor decision to run cats of any kind with turbos. They will restrict flow and cause increased thermal load on your motor in addtion to restricting power.

If you have spent the money on a TT setup, why choke it with cats?

 

Because you care a little about being legal, and about the environment. Thats one reason.

Get high flow cats. They flow almost as well as test pipes, and have the benefit of being legal and actually cleaning up the air a little bit.

 

Legal is one thing, but removing a working OEM cat is not legal in the first place, his TT setup isn't legal, and I doubt he is in state like cali. Caring about the environment is the biggest crock of **** I have ever heard. Cats don't reduce squat. they change one pollutant into another. If your car is properly tuned, this is a non issue. I don't think he cared about the additional size of his carbon footprint when he put on a TT setup (increased gas consumption), so I doubt he cares about the cats in terms of the environment.

The reduced power and increased thermal load on my motor would be bigger concerns if it were my car.

Just an FYI, on a turbo setup, resonated test pipes are not needed. A plain set of the new Helix or 2.5" APS pipes for about 200 bucks will do very nicely.

 

I just used random tech hi-flow cats, were I live they full you over and check for test pipes $$, plus the gas smell was not appealing. Random tech cats are supposed to flow very good compared with straight pipe though not equal.

 

Don't those random tech cats have a horrible rep for collapsing? With the increased exhaust temps I would think it would increase the likelyhood of this happening. If I lived in an area that required annual inspections I would just reinstal the oem cats for inspection. Swapping test pipes and cats can be done in less than 30 minutes

Regular cheapo test pipes are the way to go for a TT setup

 

Turbos are in fact exhaust mufflers. My Ingen was louder with the supercharger than with the JWTs. But I need to change my Injen, as I am sure they are causing mucho resistance to my present set up. I presently have PE high flow cats.

The last thing I need now is back pressure; as my turbos do that just fine.

I have been looking at 3" options, but they tend to be too huge to fit snugly; maybe a 2.75" may work' don't know still looking.

G

_______________________________

 

G-man

I strongly sugest the EVO TT set up... I have the AAM set up as you know. And I might be switching to the EVO TT as well. Or I might have Mike fab up a new mid section... The AAM is real tight, and bottoms out in the middle, on a lowered car.

If you need 3" then the AAM is the least noisy of the three available.

 

let me know if you wanna sell it.

 

You got PM

 

so how much horsepower would actually be gained over HFC's on a turbo setup with Test pipes? And does the smell stay in your car even after you turn it off (like in the carpeting)?

 

The higher the boost the better the chances of making more power. I ran the big 3.5 APS test pipes with my PE TT. I got used to the smell, but the car ran so much smoother than the AAM 2.5 test pipes. APS test pipe also sound sooo much sicker.

Just my 2 cents

 

Environmental concerns are legitimate as well as the nasty fuel vapor smell. And fuel vapor sticks to clothing, hair, skin. Yuck. The intensity of the smell depends on how rich you run, granted. I will sacrifice 20 whp for a clean smelling car! Get 3" HFCs if you want.

For those of you that think that cats do nothing for the environment, think again. The "cats" catalyze the following chemical reactions:

Reduction of nitrogen oxides to nitrogen and oxygen: 2NOx → xO2 + N2

Oxidation of (non greenhouse gas, but toxic) carbon monoxide to less harmful (greenhouse gas) carbon dioxide: 2CO + O2 → 2CO2

Oxidation of unburnt carcinogenic hydrocarbons (HC) to carbon dioxide and water: 2CxHy + (2x+y/2)O2 → 2xCO2 + yH2O

By the way, "carcinogenic" = "promotes cancer".

 

 

ha ha - info overload?

i was just recommending hfc over test pipes

 

werd