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extractors & 2 1/2": where's the improvement? 

 

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 Post subject: extractors & 2 1/2": where's the improvement?
Posted: Sun Apr 02, 2006 6:45 pm 
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If I were to get PH4499 extractors and a 2.5" exhaust (the usual), not including the cat, where will the improvement in power be?

I'm hoping for bottom end to mid-range, because when dragging a VS commodore, by the time we hit 60km/h they're already in their top-end power-range, which sux, coz they pull ahead about a body length before we get into our top end range. I got beaten by my friend's VS Commodore wagon with 2 people in it.

I was driving on LPG (tickford), which is hardly slower than petrol, and I have a crow cam. I still run a standard exhaust, though, and he has extractors and a 2 1/2". It's made a huge difference for his car. I'm hoping it will make a similar difference for mine. He shouldn't be beating me from the lights!
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Posted: Sun Apr 02, 2006 6:57 pm 
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Pacey comps give good low down and mid range power increase (sorry but I can never remember the part number of the standards and comps, so I just callthem standards and comps not PH4499 and PH4480).

 

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Posted: Sun Apr 02, 2006 8:11 pm 
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ph4499 are supposed to be better low-end aren't they, cause i have 4480's and the top end is better not bottom end.
I have the 4480's, highflow cat and 2.5in system, and i picked up power and torque everywhere but <1500rpm.

 

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Posted: Sun Apr 02, 2006 8:18 pm 
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dont expect any bottom end torque with a 2 1/2 system!!! go for the 2 1/4"

you cant rev the car past 6000 anyway so why run a 2 1/2 ?, youll be suffering from backpressure starvation and youll loose torque (especially if its a stock 6.......please dont include a pod filter as a modification :P)

i know someone who installed a 2 1/4 (inner diameter) and it goes noticibly well

 

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Posted: Sun Apr 02, 2006 11:18 pm 
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how much would that cost to get a 2 1/4" and extractors btw???
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Posted: Sun Apr 02, 2006 11:35 pm 
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$327 + 22 delivery off ebay for extractors

exhaust system, from 300-500

with the exhaust i would just go for a 2 1/4" inner diameter with a cat only! i wouldnt bother with resignator or muffler, but the EPA will f**k u up, so probably add a resignator

 

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Posted: Mon Apr 03, 2006 12:04 am 
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Resonator.

 

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Posted: Mon Apr 03, 2006 12:05 am 
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Allright bro! is this suppost to be Microsoft Word Spell check?

 

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 Post subject: What's standard?
Posted: Mon Apr 03, 2006 3:00 am 
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What is the standard inner exhaust diameter? Less than 2 1/4?
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 Post subject: Re: What's standard?
Posted: Mon Apr 03, 2006 7:32 am 
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spvd02 wrote:
What is the standard inner exhaust diameter? Less than 2 1/4?

2.25, with press bends, me thinks.
Why you'd go 2.25 mandrel, I'll never know...
2.5" is tried and tested.
Lost bottom end torque with just a 2.5" exhaust?
Pffft...
A 2.25" mandrel bend system will cost MORE then a 2.5", cause they'll have to custom make it, and that's if the shop even has a mandrel bender (HA).
Just get an off-the-shelf 2.5" of whatever brand you can get for the best price...

 

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Posted: Mon Apr 03, 2006 12:14 pm 
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The extractors mainly determine where you would be getting most of your power in ur power curve...exhaust will only give u between 1-5 kw and extractors will do same..
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 Post subject: 2.5" on the way.
Posted: Mon Apr 03, 2006 9:10 pm 
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Tomorrow a 2.5" cat back system will be fitted. Can't afford extractors yet, so I'll wait a while. It should free it up a bit anyway.

Got a K&N air filter today, and she's definitely got more throttle response. It's not awesome, but it's noticeable. The torque curve seems more linear as well.

Should I try push 'em to modify my cat as well? I think I might do that; make the outlet 2.5" instead of 2.25". Every little bit helps.
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