test pipe....is it worth it?
#1
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.
#3
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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.
#11
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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...
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...
#13
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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.
But, don't quote me. I was probably drunk at the time.
#16
I have the Racing Mazda DP going into the stock 1.6 Cat and on to a 2.5 Cat back Monza Pacesetter system.
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 ?
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 ?
Last edited by poobs; 03-11-2011 at 10:10 AM.
#18
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.
btw, screw those neighbors.
#19
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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.
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.