got a test pipe question
#1
Honda-Tech Member
Thread Starter
got a test pipe question
im looking to see which route is best.
i wanted to put on a test pipe because im about to get tuned. as for right now im boosted and wanted to get the most out of my tune without a cat.
my delema is that i want to appear that i do have a cat, is there a company that makes a test pipe that is hollow and looks like a cat too?
or
should i get a muffler guy to just make one?
the specs should be 2.5 inches because my pipes are that big.
i wanted to put on a test pipe because im about to get tuned. as for right now im boosted and wanted to get the most out of my tune without a cat.
my delema is that i want to appear that i do have a cat, is there a company that makes a test pipe that is hollow and looks like a cat too?
or
should i get a muffler guy to just make one?
the specs should be 2.5 inches because my pipes are that big.
#2
Honda-Tech Member
Re: got a test pipe question
what i did to my test pipe.
i have a 2.5' test pipe with the stock cat shell over it. its like 4 10mm screws and the shell comes off the cat. do a few trimming on the ends of the shell and it should bolt over the test pipe. it will tuck up when its bolted up and when you "look" to see if you have a cat, the shell is there and visible to see and assume theres a cat there.
i have a 2.5' test pipe with the stock cat shell over it. its like 4 10mm screws and the shell comes off the cat. do a few trimming on the ends of the shell and it should bolt over the test pipe. it will tuck up when its bolted up and when you "look" to see if you have a cat, the shell is there and visible to see and assume theres a cat there.
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Re: got a test pipe question
But why take it out for the tune? Do you think it will give you more power? Cats do absolutely nothing bad or good aside from help with emissions? You'd be wasting time and $$ swapping the cat out for anything, it won't make a difference with your power
#16
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Re: got a test pipe question
plus you smell your own exhausts all the time, if you wanna pretend to be in a race car its cool, but if your driving all day kinda annoying
#17
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Re: got a test pipe question
i dont smell anything with my test pipe on....ever thought about restriction?? the oem cat diameter is small oppose to a 2.5+ exhaust system (mines a 3' down pipe to a 2.5 bpipe and exhaust) thats how i think/feel though..i rather not have a restriction in flow.
#19
Crazy Honda Guy
Re: got a test pipe question
hmm, i could only see this being worth doing on boosted cars. For N/A, swapping in a test pipe makes only about 2 hp, plus you will get the bad smell and your exhaust will sound more raspy, especially on the down shifts
#21
Honda-Tech Member
Re: got a test pipe question
deetz: i dont recall smelling any fumes when i run a test pipe. my car as well do not make a raspy sound when down shifting...i run 4-1 itr header with 2.5 outlet to a 2.5 test pipe to my 2.5 bpipe out the back..before i had the header 2.5 to a stock cat with the 2.whatever diameter connected to the stock bpipe flange welded to my 2.5 exhaust and it was restricting..it sputters before it goes smoothly..then i took it to the muffler shop and installed my 2.5 test pipe and had them re-weld the stock flange to a 2.5 flange/pipe to my 2.5 bpipe..when all said and done, i got on it and the response is quick.
also run it on my turbo car and no restriction there.
but thats just my experience, maybe its different for some other people.
also run it on my turbo car and no restriction there.
but thats just my experience, maybe its different for some other people.
#22
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Re: got a test pipe question
I lost more than 2hp with a cat on my B20Vtec. Cats do restrict. I have seen it on dynos and have personally felt the difference.
I still run one though. I daily the car and have noticed a reduction in the smell emmited by the car with the cat installed.
I still run one though. I daily the car and have noticed a reduction in the smell emmited by the car with the cat installed.
#23
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Re: got a test pipe question
I speak from experience, people out there might not like or agree with taking off cats but the truth is that they are restrictions. They may not do too much on mostly stock engines, but build an engine for power and then see how much a cat holds it back.
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Re: got a test pipe question
Not really, Drive a bone stock WRX (which I once had) and then take off all of the cats. The difference is pretty drastic.
I speak from experience, people out there might not like or agree with taking off cats but the truth is that they are restrictions. They may not do too much on mostly stock engines, but build an engine for power and then see how much a cat holds it back.
I speak from experience, people out there might not like or agree with taking off cats but the truth is that they are restrictions. They may not do too much on mostly stock engines, but build an engine for power and then see how much a cat holds it back.
#25
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Re: got a test pipe question
I have opted for that as well, even though my car is modded, I put a cat on it to damper some of the emissions. Ideally, if I had the cash, I would daily a bone stock anything instead of the hatchback.
I guess I'll enjoy my old Betty until it really gets way too hot to drive her around. Until then, I'll putt putt to work and I nice drive at night or up the coast every once in a while will do. When money allows, Track Time! Woot
Edit: back to the topic, you can also just try to get a hold of an aftermarket cat, hollow it out, and run a piece of pipe through it.
I guess I'll enjoy my old Betty until it really gets way too hot to drive her around. Until then, I'll putt putt to work and I nice drive at night or up the coast every once in a while will do. When money allows, Track Time! Woot
Edit: back to the topic, you can also just try to get a hold of an aftermarket cat, hollow it out, and run a piece of pipe through it.