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post #1 of 22 (permalink) Old 03-07-2012, 03:24 PM Thread Starter
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exhaust system reccomendations

I'm getting ready to get one for my HS 2005 2.3s 4dr. Racing Beat or having a custom one made seem to be the only choices. If I go custom, what to use? 2 1/4', 2 1/2", or? RB uses a 2 3/8" od. pipe, I'm imagine that what they found to be best in their dyno tests.
What have you guys used and why? Did you do any tests to determine if the system you bought was better or worse?


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post #2 of 22 (permalink) Old 03-07-2012, 04:43 PM
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Re: exhaust system reccomendations

Most aftermarket companies do 2.25 inches on their exhausts. Stock is 1 7/8. On the larger end of the spectrum, Corksport uses a 2.4 inch pipe, Borla uses 2.5 and HKS uses 2.6 inches. Those are too big for my liking.

In my opinion, there's a happy medium, where you're big enough to allow greater flow, but still small enough to maintain backpressure and exhaust pulses at the low end.

Racing Beat and Vibrant use 2.375, which I like to maintain the best of both worlds. I have a Vibrant.

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post #3 of 22 (permalink) Old 03-07-2012, 07:23 PM
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Re: exhaust system reccomendations

Are you registered with Mazdaspeed? They offer an aftermarket Mazdaspeed sport exhaust for the 2.0L and 2.3L for $434 (regular price to the public is quite a bit more). The part # on the exhaust is GRMS-8M-L01A

Actually, this place on ebay sells them new for $399 + 45 for shipping . That's a great deal, and undercuts Mazdaspeed which doesn't happen often.

http://compare.ebay.com/like/3705798...si=y&cbt=y
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post #4 of 22 (permalink) Old 03-07-2012, 07:30 PM
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Re: exhaust system reccomendations

Does anybody know what the factory exhaust weighs from the cat-back? I think that losing some weight would be something better to look for than a few hp. I don't know what the factory exhaust weighs... I just know from removing a lot of factory exhaust pipes for whatever reason, they are usually NOT on the light side.


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post #5 of 22 (permalink) Old 03-07-2012, 07:37 PM Thread Starter
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Re: exhaust system reccomendations

Adam I didn't know about the Mazda one, have you tried it? Does anyone have any HP results before and after on any of these?
Yes, I've been a member since '97. I too would like to take some weight off the car.

thanks

Steve
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post #6 of 22 (permalink) Old 03-07-2012, 07:44 PM
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Re: exhaust system reccomendations

You're going to get between 4 and maybe 7 wheel hp on these cars with an exhaust. I've seen many dyno's, and that's about what you get. If you go cat delete or hi flow cat, you'll get an extra hp or 2.

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post #7 of 22 (permalink) Old 03-07-2012, 07:56 PM
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Re: exhaust system reccomendations

[quote author=Steve35 link=topic=205187.msg4197057#msg4197057 date=1331167058]
Adam I didn't know about the Mazda one, have you tried it? Does anyone have any HP results before and after on any of these?
Yes, I've been a member since '97. I too would like to take some weight off the car.

thanks

Steve
[/quote]

No I haven't, I'm still running the stock exhaust, but if I decide to go aftermarket I'd go with this one. My car is also my daily so going to a muffler delete pipe to save weight just isn't going to happen unless I mount up a flange for taking the muffler on/off for events but that is a PITA. Not really a fan of exhaust drone so even some aftermarket exhausts scare me some.
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post #8 of 22 (permalink) Old 03-07-2012, 08:00 PM
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Re: exhaust system reccomendations

Now... can you get a better flowing exhaust that is still as quiet as stock? That's what I would ideally want... I don't need to be letting out obnoxious fart noises during daily driving. I hate attracting attention and idiots wanting to race me.


I think IF and when I decide to do a cat back(it is VERY low on my priority list), custom will be the way to go... Probably all aluminum for cost. Titanium/Inconel/Stainless wouldn't be needed because the exhaust won't be scraping anything(vehicle isn't lowered), and has no need for dealing with extreme heat(non turbo).

Here are a couple pretty cool sites I found with some neat lightweight mufflers and other goodies:

http://www.higherarcing.org/services


Edit: Click on the "technology" link on this page... lots of really good info!!!
http://www.burnsstainless.com/


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post #9 of 22 (permalink) Old 03-07-2012, 08:12 PM Thread Starter
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Re: exhaust system reccomendations

Thanks for the links. I know of Burns, but not the other guys.
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post #10 of 22 (permalink) Old 03-08-2012, 05:36 PM
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Re: exhaust system reccomendations

I've thought about this - I'd rather give up the few HP that an exhaust give if I can lose the weight.

I'm also double damned as I have a CA emissions car and thus two cats.

If the exhaust ever goes, and after 112K, it still looks good, I wonder if putting a SuperTrapp would do the job.

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