running catless
02-09-2006, 01:34 AM
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running catless
first off to let you guys know im looking for FREE EASY power. so i decided to run catless and install alphawerks headers to free up some much needed horsepower, to prepare for the soon to be announced FORCED INDUCTION. 
ok, after a ton of searching i found what i was looking for. so i ordered a o2 sim from casper elect, a buddy fabbed up a bypass pipe to put in the place of the cat with a bung welded for a wide band o2 sensor for later tuning.
first off i noticed the possible problem with droning headers. the welds are thick and bulky creating turbulent exhaust gasses to pass over them creating noise. i will be wrapping the headers to save all the excess heat i can in order to keep it out of the engine bay which will also cut noise. i will finish this setup over the weekend and let you all know how it goes.
any thoughts ?
ok, after a ton of searching i found what i was looking for. so i ordered a o2 sim from casper elect, a buddy fabbed up a bypass pipe to put in the place of the cat with a bung welded for a wide band o2 sensor for later tuning.
first off i noticed the possible problem with droning headers. the welds are thick and bulky creating turbulent exhaust gasses to pass over them creating noise. i will be wrapping the headers to save all the excess heat i can in order to keep it out of the engine bay which will also cut noise. i will finish this setup over the weekend and let you all know how it goes.
any thoughts ?
02-09-2006, 10:47 AM
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I'm not running a cat on my car, it did make my exhaust tone a little deeper but other than that, I didn't notice a sound difference. I have apexi ws exhaust by the way.
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02-09-2006, 08:15 PM
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For some reason turbo cars are quieter than NA cars without a cat...
And I ran without a cat on my '94 Accord 4 cyl and it was obnoxiously loud after I removed it.
And I ran without a cat on my '94 Accord 4 cyl and it was obnoxiously loud after I removed it.
02-10-2006, 01:11 AM
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Originally Posted by Time For Sleeep
Sounds pretty sick mang.
How are the alpha werks? they give you any problems?
How are the alpha werks? they give you any problems?
i am not done installing them yet,we will see how that goes.
02-10-2006, 01:12 AM
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Originally Posted by phipark
How JetHot coating instead of wrap?
this is gonna sound weird but im NOT patient enough to wait and have them coated.
02-10-2006, 01:38 AM
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Originally Posted by Time For Sleeep
Hah, a bit weird.
How much does header wrap run for ?
How much does header wrap run for ?
depending what size you buy it can be had as little as 40 bucks. not a bad deal
anyone local want to help me work on my car tomorrow...lol
02-10-2006, 11:20 AM
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Originally Posted by blk2001tlon19s
Yeah I have a turbo but why would that make it quieter? The exhaust is going to flow through there turbo or not.
02-10-2006, 03:53 PM
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ok update!!
last min i decided to run a cat, not because of what everyone said about noise, but because i wanted to be "legal" running on the street. so i took the oem cat assy and the other hi flow i had here at home. first off the hi flow you can see through clearly almost, the factory one you can see a small spec of light through it, there is a very clear difference between the two which is cool. i hope to bump up HP by doing this minor mod while im putting in my headers. here is a pic of how it looks side by side. i will give my impressions later on. also the weight is very different between the two, i will guess at a 4-5 lbs loss of weight not including heat shields.
last min i decided to run a cat, not because of what everyone said about noise, but because i wanted to be "legal" running on the street. so i took the oem cat assy and the other hi flow i had here at home. first off the hi flow you can see through clearly almost, the factory one you can see a small spec of light through it, there is a very clear difference between the two which is cool. i hope to bump up HP by doing this minor mod while im putting in my headers. here is a pic of how it looks side by side. i will give my impressions later on. also the weight is very different between the two, i will guess at a 4-5 lbs loss of weight not including heat shields.
02-11-2006, 02:23 AM
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Originally Posted by moomaster_99
Oh yeah...not to mention you lose a shitload of torque....and gain very few hp.
yes i agree that there is NO need to loose torque, and i am guessing at a max 5hp increase in power, and i know that number increase is pushing my luck.
overall the car should run much better, especially when i install the supercharger or turbo. i am still waiting to meet up with allmotor to discuss what i could possibly run on the car. but no matter what im not going to run a catback exhaust to keep the stealth look.
02-11-2006, 10:18 AM
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Originally Posted by moomaster_99
Oh yeah...not to mention you lose a shitload of torque....and gain very few hp.
02-11-2006, 06:13 PM
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ok im done with the install. and i must say this thing hauls ass now, much better than i thought it was going to be. i do feel like my take off isnt quite punchy as before but it is still impressive from 2300 rpm's and above. when vtec kicks in its not as noticeable as before but the mid range punch is very fun.
note: installed was ice box/alpha werks headers/hi flow cat/o2 simulator.
note: installed was ice box/alpha werks headers/hi flow cat/o2 simulator.
02-11-2006, 06:59 PM
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good job, man. so how much louder would you have to say it has gotten? obviously we're also taking into account the increased flow due to the I/H/CC.
02-12-2006, 01:01 AM
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Originally Posted by Sun Diego CL-S
good job, man. so how much louder would you have to say it has gotten? obviously we're also taking into account the increased flow due to the I/H/CC.
honestly the noise increased about 10-15% no resonating headers like the guy that i bought them from said they were doing. overall im very pleased by the outcome and would recommend this mod combo to anyone. i think the headers resonate when installed in a rush, i paced this install out over 3 days and took my sweet time to make sure i wouldnt have to do it 2 times.
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