Fully Open Exhaust Good or Bad?
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Fully Open Exhaust Good or Bad?
I need to know if i open my exhaust up will it degrade my performance. I have an OBX Stainless Steel 4 - 1 Header that goes into the down pipe to the cat and the straight back to the Bomz Evo Spec Muffler. I cut the resonator off and welded a straight piece of pipe in its place. I want to buy the Megan Racing Cat but I'm afraid that with little to no backpressure I will encounter problems. Emissions don't concern me cause Arkansas doesn't do state inspections. What do i do?
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From: Grapevine, Texas, US
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Well people haven't had any problems, plus it is a 7thgen, it's not like i/h/e help at all for us. Also for future non-flaming purposes use the SEARCH button at the top of the page it will stop a$$holes like me from flaming you about posting something that has been talked about a gazzillion times.
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From: Grapevine, Texas, US
Rep Power: 0 oh and I am about to run without a cat anyways. It won't hurt. Back pressure has more to do with the actual piping than it does the cat and resonator.
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From: SOUTHMPTON,NJ
Rep Power: 287 if your going to either get the high flow cat or go turbo, than i say do it. but if your not dont it wont give u n e hp and it will make u sound like a weedwhacker without a muffler!!!
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From: Und3Rgr0unD
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Originally Posted by 2K2REDCIVIC
if your going to either get the high flow cat or go turbo, than i say do it. but if your not dont it wont give u n e hp and it will make u sound like a weedwhacker without a muffler!!!
You didn't even read his post did you? It has nothing to do with taking off the muffler.
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From: Mississauga,ON
Rep Power: 0 could someone help me out, ive checked other threads but when u get a header such as the kamikaze, they also sell a downpipe that goes with it, whats the difference? i have an EX(si), thanks
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Rep Power: 0 ^^^^WWW.SEARCHBUTTON.COM and don't steal someones thread!
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From: LA, CALi
Rep Power: 403 the only problem is that you will not have any low end torque...
right now i got the hp header and a high flow cat.... and 2.25 mendrel bent piping... i took off my exaust and bolted up my stock exaust and i can feel my low end so much better, it also feels better when i accerate... for some weird reason... o yea.. it is soo much quiter...
right now i got the hp header and a high flow cat.... and 2.25 mendrel bent piping... i took off my exaust and bolted up my stock exaust and i can feel my low end so much better, it also feels better when i accerate... for some weird reason... o yea.. it is soo much quiter...
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From: Oklahoma City
Rep Power: 0 I dynoed my 2001 civic EX twice. Once with stock header/cat, 2.25" cat back piping, and a warlock muffler. I put down 113.1hp and 107.0ft/lbs. 20min later, I dynoed exact same setup, only with no muffler(straight pipe from the cat back). I put down 113.5 and 107.3ft/lbs. So, in my case, straight pipe yielded minimal gain, but was with the restriction of the stock header and cat.
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Originally Posted by Honda2k4
Master that link doesnt work, lol
but anyways, so its better to get the header that comes with the downpipe right? right now i have a magnaflow cat-back exhaust
but anyways, so its better to get the header that comes with the downpipe right? right now i have a magnaflow cat-back exhaust
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From: SOUTHMPTON,NJ
Rep Power: 287 First of all MASTER u need to reread my post be for flaming n e one. i wasnt saying he wasnt going to have a muffler. i said his car would sound like a weedwhacker without a muffler. and there's no need for you to come into a post and start flamming n e one for n e thing, expecially since you have NOTHING INTELLIGENT TO SAY!!!!!!!! 
and lets use some common sence what has more back preassure a resonator/muffler or the piping..
come on now any one and figure that out, and u should watch the advice u give people, because running a n/a motor without enough backpressure will blow it up.
how would u feel if he blew his motor gettin 1 hp cuz u said its better.
and lets use some common sence what has more back preassure a resonator/muffler or the piping..
come on now any one and figure that out, and u should watch the advice u give people, because running a n/a motor without enough backpressure will blow it up.
how would u feel if he blew his motor gettin 1 hp cuz u said its better.
Last edited by 2k2redcivic; Aug 6, 2004 at 07:24 PM.
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From: SOUTHMPTON,NJ
Rep Power: 287 you'll put alot of pressure on your rings having no back pressure. im sure there's plenty of people that will agree with me, and its not worth the 1-2 hp gain. ull never feel it and your car will last a whole lot longer.
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From: elmhurst IL
Rep Power: 0 well it kind of depends if your planning turbo the most critical thing for high boost is free flowing exhaust but if your just going ihe like most people there is no need
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Rep Power: 0 Yeah I'm going all motor for now, saving up money for a supercharger if Vortech or Jackson will ever come out with one, so I guess until then I'll leave the Cat on. Thanks for the replies. 
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