[YLDS2K]

Hi guys so I'm looking at buying a test pipe/resonator to bolt up with my HKS HiPower exhaust and was wondering if I should be getting the 60mm or the 70mm?

Secondly

Is there a difference in performance/sound with a teat pipe and what brands do you guys recommend? And what will I need to complete this little mod? Million dollar question is also, is it really worth it?

Thanks guys

Btw if anyone has one and it's in good condition let me know thanks again

This post has been edited by YLDS2K: 11 June 2011 - 08:27 AM

[Riviera]

The 70mm apparently makes more power than 60mm even when your exhaust manifold collector is prob 60mm. I am still not convinced TBH but there is an article this guy did the dyno and elaborating the whole reason.

Test pipe is less restrictive than OEM cat period and more free flowing exhaust gas = more power. I have HFC installed and it works a charm. I can feel even at lower rpm the extra oomph. OEM cat is surprisingly restrictive. Not to also mention it amplifies your exhaust note and since you have HKS HiPower I bet it will sound sexier.

I have no exp with test pipe but after reading lots of people feedback you'll have to bear the smell which is logical since it has no restriction whatsoever. Hence my decision to go with HFC, which is best of both worlds with around 80% flow of a test pipe.

Not sure about brand, mine is Berk which has wonderful welds and the craftsmanship is amazing though can't put the OEM heatshield on since it'll rattle. I guess you get what you pay for.

J's test pipe can be fitted inside the OEM heatshield which is handy if those cops do the underbody inspection.

[YLDS2K]

So r u saying I can fit the 60 or 70mm because on both ends they will bolt up to the standard headers? When you say "deal with the smell" do you mean the smell of fuel in the cabin? And do all rest pipes rattle?

Sorry but these are noob questions and don't have the search function on my iphone

[vyets]

The smell of carbon monoxide poisoning hahah it stinks.

yes a 60mm or 70mm will fit to your standard header.

I would advise you to go 60mm with your exhaust setup as the HKS is only a 60mm exhaust, if you get a 70mm testpipe it will have a bottle neck effect 60 -> 70 -> 60.. 70mm test pipes are good with a 70mm exhaust.

It's a decent mod prob net you afew kw however it's extremly illegal in aust.

It's a pretty simple mod and an exhaust shop can make one up for you for about $60 that's if they're willing to do it in the first place.

There is a increase in sound but not too dramatic, it will make your hks sound alot nicer. The sound is not much louder on idle it's more noticeable at WOT.

[AusS2000]

"deal with the smell" of nitrogen dioxide.

http://en.wikipedia....itrogen_dioxide

Catalytic converters cause toxic nitrogen dioxide to break down into harmless nitrogen and oxygen.

But this is not all cats do:

Reduction of nitrogen oxides to nitrogen and oxygen: 2NOx → xO2 + N2
Oxidation of carbon monoxide to carbon dioxide: 2CO + O2 → 2CO2
Oxidation of unburnt hydrocarbons (HC) to carbon dioxide and water: CxH2x+2 + [(3x+1)/2]O2 → xCO2 + (x+1)H2O
Stop you getting a $10,000 fine

In my opinion they are a good thing and worth the 2hp they cost.

[s2kadrenalin]

You just have a car thats so low they can't see under there

[AusS2000]

Yeah, great way to avoid police attention.

[YLDS2K]

Thanks vyets for your input that's what I wanted to know now all I got to decide on is brand I prefer to get one already made from a reputable company so when it comes time to selling it I won't have issues.

AusS2000 that's interesting to know but I have no idea how that works I just think that this is my answer to Julia gillard's carbon tax lol

And

s2kadrenalin my car has had a 1.25 inch drop all round so I think I should be all good lol

Any places where u guys suggest buying these from for a reasonable price?

This post has been edited by YLDS2K: 11 June 2011 - 11:09 PM

[AusS2000]

Funny you should mention carbon tax. When catalytic converters were introduced in the 80's British Prime Minister Margaret Thatcher was opposed to them because although they converted noxious gases, what they converted them too was nitrogen and oxygen (basically air) and CARBON DIOXIDE. Seems Maggie was before her time.

[s2kadrenalin]

AusS2000, on 11 June 2011 - 11:02 PM, said:

Yeah, great way to avoid police attention.

I'd rather a defect for too low than a defect for a TP.

[AusS2000]

Here's a Berk HFC. 90% of the gain (1.8hp instead of 2) and no rotten egg smell or acid rain.

http://www.s2ki.com/...passenger-seat/

[AusS2000]

s2kadrenalin, on 11 June 2011 - 11:43 PM, said:

I'd rather a defect for too low than a defect for a TP.

I said 'attention'. Once you've got their attention don't you think they'd notice the rotten egg smell? I suppose you could tell them you ate a bad curried egg sandwich.

[YLDS2K]

AusS2000, on 11 June 2011 - 11:43 PM, said:

Here's a Berk HFC. 90% of the gain (1.8hp instead of 2) and no rotten egg smell or acid rain.

http://www.s2ki.com/...passenger-seat/

Yeah that seems ok but I think I'll go for a 60mm is the smell really that bad like does it make u choke in the cabin and need to constantly have a window open?

[AusS2000]

Well the smell is on the outside, and the car is a convertible so I'm not sure what opening a window will do.

[YLDS2K]

I meant with roof on and windows up

[AusS2000]

In that case putting the window down will definitely help you smell it.

[YLDS2K]

I think you struggle to understand what I mean, will the smell make it way into the cabin with roof on and windows up? Thus to reduce the smell u need to open a window

[AusS2000]

Dunno. I didn't buy a convertible to drive around with the roof and windows up and can't afford a $10,000 fine so haven't removed my cat.

[YLDS2K]

Why do some test pipes mention a CEL fix? It seems more practical to buy myself a HFC as riviera suggested. Evasive have one and the description says

High flow metallic substrate catalytic converters, OBDII & 49 state compliant. Full stainless steel construction. Our test data shows that this cat flows 87% as well as a test pipe vs. 43% for the OEM Cat. Smog legal, high flow, no test pipe smell. You can have it all....

But it's a 63.5mm is that right? Price? $225 + shipping

[Ape-x]

You will need a CEL(Check engine light)fix to stop the sensor attached to the cat from tripping the check engine light. I think it's to do with heat, That the sensor now being closer to it.
A celfix should knock you back about $50 - $100 Which is kinda steep when it's just little bit of pipe with a thread at each end.

If you know a fitter they may be able knock one up, All you need is 2 pieces of steel pipe(stainless or something that won't rust)about 15-20mm diameter. one about 100mm And the other about 30-40mm, cut them at 45 degrees and weld them together at a 90 degree angle. tap the long end to fit the sensor, and button the short to fit on the test pipe.
If you understood any of that then you will know more accurate measuring will be required but you get the jist.

And just for the record I have a 70mm skunk2 t/p($75us) Attached to 5zigen headers($600us) and a skunk2 70mm into 60mm spit cat-back($750us)(postage was about $800us). loud as hell, but the trick is not to have the car under too much load as you coast past the 5-0. and I kinda like the smell.

[YLDS2K]

Ok cool I just had a look at evasive and they have a CEL fix for $40

http://www.evasivemo...da_S2000_Intake

[mcopley]

I wouldn't spend money on a CEL Fix kit unless you find that you actually need one. I have been using an Invidia 70mm test pipe on my (track only) car for 3 years and i've never had a CEL. I can't smell anything with the roof on and the windows up - in fact, I don't recall smelling anything with the windows down either.

[s2kadrenalin]

^This.

[YLDS2K]

Ah ok fair enough well what I'll do is find a HFC first and then see if I develop a stink if anyone is aus is selling one please pm me

[AusS2000]

You won't get stink or CEL with a HFC.