Best downpipe for stock catalytic?
Mar 27, 2005, 09:42 PM
#1
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Best downpipe for stock catalytic?
Which is the best downpipe for the stock cat? I keep hearing that 3" is the best, but if you have the stock cat, it defeats the purpose of the 3". That eliminates the helix. I know the Helix bolts to the stock cat, but what's the point? I know 3" makes more power, but with the stock cat won't I be better off with a 2.5" such as the HKS one? 
Mar 27, 2005, 10:08 PM
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Originally Posted by lil'evil_evo
How about this just remove the stock cat and get a cat delet or at least a hi-flow cat. I am in way advising for you to buy a hi-flow cat 
Mar 27, 2005, 10:10 PM
#7
Originally Posted by inariv5573
Which is the best downpipe for the stock cat? I keep hearing that 3" is the best, but if you have the stock cat, it defeats the purpose of the 3". That eliminates the helix. I know the Helix bolts to the stock cat, but what's the point? I know 3" makes more power, but with the stock cat won't I be better off with a 2.5" such as the HKS one?
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Mar 28, 2005, 01:09 AM
#9
Originally Posted by bluebanana23
Buschur makes 2.5 downpipes. HKS is 2.75 btw not 2.5.
HKS is 65mm...which equates to roughly 2.56" in diameter, which is the correct internal diameter. www.hksusa.com
Inariv5573 - I was considering going with the Fujitsubo 2.70" inch or Espelir 2.75"........but I think for maxium boost on the low end...the HKS would probably be the best bet.....or the Buschur.....
However....If you live in CA....and you have a new car....ur looking about rougly 6 yrs before you even smog it....(unless u get pulled over and searched).....
.....I'd say HKS....good quality...and I'm sure the techs there know what they are doing....
Mar 28, 2005, 08:15 AM
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Originally Posted by inariv5573
No I want to stay with the stock one...the reason? Can you show me a high flow cat that will guarantee not to throw a CEL and pass state inspection? And not fail after years of use? Gotcha there didn't I?
Mar 28, 2005, 08:24 AM
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No I want to stay with the stock one...the reason? Can you show me a high flow cat that will guarantee not to throw a CEL and pass state inspection? And not fail after years of use? Gotcha there didn't I?
I have no cat and NO CEL and I can pass Inspection, GOTCHA THERE DIDN'T I!!! WAH WAH WAH!!!!!!!!!!!
Mar 28, 2005, 08:30 AM
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Originally Posted by umiami80
I have no cat and NO CEL and I can pass Inspection, GOTCHA THERE DIDN'T I!!! WAH WAH WAH!!!!!!!!!!!
Mar 28, 2005, 08:37 AM
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No cat, I uses a 02 Sensor mod that everyone esle uses. Stock Cat will cause you High RPM Knock if you are looking for power, trust me, it is by far the most restrictive unit on your car.
Mar 28, 2005, 08:41 AM
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Originally Posted by umiami80
No cat, I uses a 02 Sensor mod that everyone esle uses. Stock Cat will cause you High RPM Knock if you are looking for power, trust me, it is by far the most restrictive unit on your car.
There is just no way. I am sure when they place the probe in your tailpipe, the hydrocarbons etc. go off the charts! Not to mention you probably have that terrible smell and excessive fumes coming out the back.
Last edited by inariv5573; Mar 28, 2005 at 08:45 AM.