test pipe....is it worth it?
I've got a turbo'd system, 2.5" enthuza exhaust and was thinking about getting a test pipe in replacement of my cat. Is it worth the worth in reference to performance gains? Also, what will it do to the sound? Its on the border of nice growl and loud right now, and i don't really want it to be any much louder.
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This response is strictly coming from being NA - but will be noticeably louder and only gained 3-5 HP from it.
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it will get louder. it will spool quicker. only you can determine if it's worth it to you. i run cats on my turbo cars as I am very happy with the spool I have and I don't want them to be louder. I run 3" exhausts though.
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i got one, turbo spooled a smidgen quicker, whole car felt a little more lively, but it was noticeably louder
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I will let you know what a metal core cat will do in place of the stock one, hopefully later today.
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or Artie, Tim, Evank and I can tell you the spool improvement with the metalcore cat is fucking awesome. Hence the reason we don't run test pipes.
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I dont know what ur talking about. My car sux. I only killed a 02 vette and a supercharged 04 GTO yesterday by A LOT.
I love the sound of my exhaust though with the metalcore cat and magnaflow. Thanks Tim! |
As a point of data, on my Talon, just by gutting the stock cat- on an otherwise completely stock exhaust system- I was able to make 7psi of boost free revving in neutral as opposed to 0psi before.
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Metalcore cat and cheap prices from performancepeddler.com FTW!
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Non-emissions state= Yes
Emissions state= No Alternative? I've looked into these metal core cats and they're worth it. |
GRM had a very good test recently on cats. Their testbed was a NA miata normally aspirated. The metal core cats performed equally or only slightly worse than a test pipe. The results would probably scale when adding FI but the difference was small. I have a magnaflow spun metal cat and a test pipe. When I finally tune my car on the dyno I'm going to put the cat on because I'm tired of huffing fumes.
Side question--- will backfire from the tailpipe (yes I know it's technically called midfire) blow apart my cat? I'm guessing not since it's upstream... |
Originally Posted by 944obscene
(Post 319127)
Emissions state= No
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I remember a similar discussion on m.net, where people were discussing the benefits of this and that exhaust diameter, and Corky put an end to it by saying that the cat offers the biggest restriction in the entire system.
But, don't quote me. I was probably drunk at the time. :D |
I have a test pipe on my car,I will most likely be picking up a metal core hi-flow cat from ETD racing.
I love the sound & quick throttle repsonse of the test pipe,but I can't stand the smell,it fucking stinks. |
It seems like a no-brainer. Even a fancy metal core cat is a compromise.
Sam, can you dyno with no cat at all as well? |
I have the Racing Mazda DP going into the stock 1.6 Cat and on to a 2.5 Cat back Monza Pacesetter system. :vash:
I'm between a larger cat and a test pipe http://www.racingmazda.com/miata-exhaust.htm Is the test pipe very loud ? Right now my car is very quiet. Is it going to sound like a turbo fart can ? |
since your turbo i would definitely go catless. i noticed a big difference on my GSX when i went catless, better spool up and you cant go wrong shooting flames. my s2k and miata both were NA and those i really didnt notice much difference in power
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I realize this thread is two years old, and shame on you two, but I believe I have some pertinent information. From my turbo to the back of the car is basically a 2.5" run, with a test pipe, and it's loud as hell (droaning). So I'm living with my in-laws right now while my house is renovated, and one of the neighbors had an aneurism about how loud my exhaust is. So I happened to have a brand new 1.8 stock cat sitting in my basement. I went home and put it on. Exhaust became substantially quieter, like to the point where my head didn't hurt on trips and I didn't have to crank my music. But goddamn, the power loss was INSANE. Turbo spooled so much slower, and it just felt lethargic. I'm guessing a 30% decrease in power. After a week of that I put the test pipe back in. The power came right back and I'll live with the loud noise.
btw, screw those neighbors. |
I feel bad for my neighbors - I drive through with a 3" strait pipe every day at 7am.
I have a strait pipe, so no cat obviously, and I'm wavering on weather or not to get one. On one hand, I very much enjoy shooting flames and popping on decel, but on the other hand I DO care about the environment. |
3" Turbo back straight pipe or bust.
/thread |
I have a 3" Enthuza, removed the cat, and it went about .3 leaner across the board...so it's moving more air now. I'm not sure if it was worth it or not.
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I have an artech 3 inch, just 3 inches all the way to the muffler, (Magnaflow) and it is a little louder than my obx dual exit with resonated test pipe. You don't really notice til the wastegate opens up. I never have ran a cat in my car, but... if it is like the difference from going to 2.5 inches to 3 inches then yes, it matters alot.
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its worth it to go catless. less restriction is better. you can always swap it out if you need to.
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I'm running a test pipe with my FM 2.5" non-resonated system, so the only restriction between the turbo and the bumper is a single muffler, and it is not loud AT ALL. Top down while driving, the intake noise is louder than the exhaust, and I only really hear it when going through underpasses. It would be a different story if it were NA, since the turbo quiets things way down.
C |
I've been thinking about running a test pipe too. Is there a specific brand that is better than others? Or is it just pick any one of them up depending on how much you want to spend?
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Originally Posted by Corwin Bowersox
(Post 1554567)
I've been thinking about running a test pipe too. Is there a specific brand that is better than others? Or is it just pick any one of them up depending on how much you want to spend?
It's a fucking tube with a 2 flanges on it. There's not really anything on it that would make any brand "better" Go to the exhaust shop and give them $20 to grab a piece of pipe from the bin and weld a flange on it for you. |
Originally Posted by hks_kansei
(Post 1554573)
Go to the exhaust shop and give them $20 to grab a piece of pipe from the bin and weld a flange on it for you. |
Originally Posted by Corwin Bowersox
(Post 1554567)
I've been thinking about running a test pipe too. Is there a specific brand that is better than others? Or is it just pick any one of them up depending on how much you want to spend?
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