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Brand exhaust vs. Custom exhaust

 
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Old 04-30-2010, 06:16 AM
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Brand exhaust vs. Custom exhaust

Hey guys. Looking to get a new exhaust system within the next few months and have done quite a bit of research into the whole thing.

Only problem is, for me, living outside the US it's really hard/expensive to get a good brand exhaust e.g EVO II, N1, etc

So I have been considering getting a local exhaust shop to custom build me a system and was wondering what you guys think? I know exhausts alone don't give amazing HP gains but thought a custom system might give restrictions later down the road when I want to do more mods?

Also what do you guys think of removing the cat converter and going the straight through route? Good? Bad? reasons backed up with facts please :D

(p.s This is my first thread so I apologize if I have done anything incorrect)
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Old 04-30-2010, 12:17 PM
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Re: Brand exhaust vs. Custom exhaust

sucks for being international, but if you are going boost you'll need 3 inch piping, I've read on here that it should be 2-2.5, (please correct me if im wrong) I'm planning to get a custom 3 inch pipe with no cat. for my turbo build, but this site here has alot of excellent sources and people that can help you. just do a little more research. :D hope all goes well!
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Old 04-30-2010, 01:13 PM
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Re: Brand exhaust vs. Custom exhaust

When it comes down to it, a pipe is a pipe. If you can get a local shop to make you an exhaust I don't see anything wrong with that especially if it's cheaper than having something shipped overseas.

Judging from the pics in your profile, it looks like you have the H22 motor; I know you have or will probably come across a decent amount of controversy on what size exhaust to use, and I'm in the process of locating a thread to link for you that shows dyno charts of 3" exhaust actually increasing HP over 2.25" and 2.50", non-turbo applications. I will post that if I can find it again.

When it comes down to it though, if you get an exhaust system that isn't mandrel-bent (it's rare you find a shop that has a machine to do mandrel bending because of the expense), the piping diameter is really only gonna be as effective as the diameter in the bends, which will typically be 1/2in smaller than in the straight portion of the pipe.
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Old 04-30-2010, 01:36 PM
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Re: Brand exhaust vs. Custom exhaust

I can't find the exact one I'm thinking about, I think it's somewhere on preludeonline.
But;
Here's a lengthy discussion about it on an S2K forum. I know it's not a prelude forum, but the overall discussion isn't necessarily about exhausts on that particular vehicle, rather 4-cylinder Honda's in general.

And here's a random page that's been referenced in another thread in our forum.

This is a thread off PreludePower. Shows the dyno comparison between a tuned 2.50in and a tuned 3in.
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Old 04-30-2010, 05:04 PM
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Re: Brand exhaust vs. Custom exhaust

Quote:
judging from the pics in your profile, it looks like you have the H22 motor; I know you have or will probably come across a decent amount of controversy on what size exhaust to use, and I'm in the process of locating a thread to link for you that shows dyno charts of 3" exhaust actually increasing HP over 2.25" and 2.50", non-turbo applications. I will post that if I can find it again.
There is still a "debate" going on between which is better: 2.5" or 3" for the H22.



Do you have any work (or plan on doing any work) done? CAI, header, headwork, etc? If so, I'd go with the 3" setup (custom or otherwise) to take advantage of it, get a chipped ECU and get that bad bear tuned. When I get the money down the road I'm def going the 3" route.
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Old 04-30-2010, 07:28 PM
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Re: Brand exhaust vs. Custom exhaust

Thanks a lot guys, really helpful info!

Yeah sorry I should have mentioned, my motor is a stock JDM h22a which means a bit higher compression than most of the stock USDM ludes. At the moment it is bone stock, done to the intake, although I plan the usual IHE setup and I'll see how it goes from there. I'm almost certain that boost won't come into it but hey, you never know right?

As for the mandrel bending, I'll keep an eye out for that thanks, Theres loads of exhaust places around where I live so I should be able to find something.
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Old 04-30-2010, 07:29 PM
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Re: Brand exhaust vs. Custom exhaust

Its not a on going debate guys!

http://bbmoto.net/wiki/index.php?ExhaustTheory

For some reason the link takes about a min to load, but its there.
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Old 04-30-2010, 07:39 PM
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Re: Brand exhaust vs. Custom exhaust

That's why "debate" is in quotes. There are a few people out there who still swear a 3" exhaust hurts the H22's output.
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Old 04-30-2010, 07:52 PM
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Re: Brand exhaust vs. Custom exhaust

How much of a power difference is being "debated" ?
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Old 04-30-2010, 07:54 PM
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Re: Brand exhaust vs. Custom exhaust

Just take a look at the links in the previous few threads. They'll tell you. It's all in the charts.
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Old 05-03-2010, 10:41 PM
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Re: Brand exhaust vs. Custom exhaust

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Originally Posted by joshdin182 View Post
Hey guys. Looking to get a new exhaust system within the next few months and have done quite a bit of research into the whole thing.

Only problem is, for me, living outside the US it's really hard/expensive to get a good brand exhaust e.g EVO II, N1, etc

So I have been considering getting a local exhaust shop to custom build me a system and was wondering what you guys think? I know exhausts alone don't give amazing HP gains but thought a custom system might give restrictions later down the road when I want to do more mods?

Also what do you guys think of removing the cat converter and going the straight through route? Good? Bad? reasons backed up with facts please :D

(p.s This is my first thread so I apologize if I have done anything incorrect)
Custom is always better you can tailor it however you want. I would say if you can take the section out that makes a 90 degree bend and make that part of the exhaust a little straighter then that would be good. if it wasn't for the spare tire waste of space I'd do the exhaust right down the middle like the mini cooper or boxster. Ah boxster a little different animal but you get the idea? Now for diameter I've heard alot on this subject and I could tell you at least 2.5 inches I have no idea the conversion on that as you said you live outside the US. My conversion calculator tells me 2.5 inches is 63.5mm is a decent size piping. If you are considering forced induction I would say 3.0 inches or 76.2mm
Hope that helps.
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Old 05-04-2010, 01:42 AM
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Re: Brand exhaust vs. Custom exhaust

Yeah thanks a lot guys, awesome help. I think i shall go the custom route. I'm going to start talking to some mechanics this weekend and check out prices etc

Forced induction as i said, is probably unlikely, within the near future anyway, so I'll most probably go with 2.5 inch although I have definitely not set that in concrete and will discus the diameter with the mechanics.

Thanks again guys, much appreciated
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Old 05-04-2010, 02:36 AM
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Re: Brand exhaust vs. Custom exhaust

Do you know some mechanics that have experimented with exhaust diameter on H22's? If you plan on even doing the basic bolt-ons, you might as well go with the 3" sooner than later to save yourself time and money in the long run. Wish I would have.
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Old 05-04-2010, 03:10 AM
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Re: Brand exhaust vs. Custom exhaust

Yeah A local shop performance exhaust shop here has done a decent amount of h22a's so I'd expect them to know a bit about what works. So your saying might as well go 3 inch? even if there is no chance of boost?
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Old 05-04-2010, 10:11 AM
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Re: Brand exhaust vs. Custom exhaust

Yes. Did you get a chance to look at the dyno's that Lindso posted? I don't see why you wouldn't go 3".
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Old 05-05-2010, 12:23 AM
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Re: Brand exhaust vs. Custom exhaust

Yeah I did, very impressive. Yeah I think I'll go with 3" then, But as I said, nothing set in concrete.

Thanks again for all the info :D
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Old 05-06-2010, 06:05 PM
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Re: Brand exhaust vs. Custom exhaust

I have heard about these cars, doing really well with opening up the diameter of the pipe. But 3 inch would be the absolute largest I would go. Plus it will be hard to pipe that thing back if your ride is lowered at all I can just hear all the scrapes going in and out of parking lots.
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Old 05-06-2010, 06:16 PM
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Re: Brand exhaust vs. Custom exhaust

If you don't scrape you ain't ****.
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