Newbie Autocrosser, annoyed that I can't hear my car on-track!! - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 37 (permalink) Old 03-22-2011, 03:56 PM Thread Starter
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Newbie Autocrosser, annoyed that I can't hear my car on-track!!

Car: 2004 Mazda 3 S Hatch - Very stock right now.

I'm not sure how much it really matters, but I find it maddening that I can't hear my car while I'm autocrossing. Even my friends who were working my heat said it just sounds like tires going by. It's basically silent. I'm not sure if hearing the exhaust/engine would help me judge speed without looking at the speedometer, but it sure couldn't hurt.

However, in order to stay in H-Stock, I can't change anything in front of the last catalytic converter. Everything behind the last cat is fair game, so I can install a true catback, as long as it's behind the last cat. The problem I'm running into is that most of the catbacks seem to replace the last cat with either a testpipe or a hi-flow cat (specifically the corksport unit).

I haven't crawled under the car to see how it's all bolted together, but I assume there's a flange back there somewhere to bolt on an exhaust behind the last cat, if for no other reason than allowing me to hear the thing a little better.

Ideas?

Thanks!
-Eric
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post #2 of 37 (permalink) Old 03-22-2011, 04:06 PM
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

There are quite a few very nice catbacks which are stock class legal. My personal favorite is the Racing Beat exhaust.

It's very tricky to get the entire OEM catback out as one piece because it's bolted on before the rear subframe at the factory; so most exhaust shops just cut it in half then take it off. Most aftermarket exhausts arrive in 2 or 3 pieces that bolt together so they're easier to reinstall than the stock one is to remove.


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post #3 of 37 (permalink) Old 03-22-2011, 04:20 PM
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

Get a borla, light and sounds great.


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post #4 of 37 (permalink) Old 03-22-2011, 04:22 PM
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

Solid motor mounts (StreetUnit, TRZ, CP-E, AWR). Not only is the sound louder from behind the wheel, but it provides a great feel as well. And, it nearly eliminates wheel hop at the start line or pulling through a corner. This won't help your friends hear you, but it will help the driving senses tremendously. If you want to further enhance the feel, get some braided brake lines too.

***Replacing motor mounts and brake lines is NOT legal in Stock.

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post #5 of 37 (permalink) Old 03-22-2011, 04:23 PM
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

[quote author=ClemsonMZ3 link=topic=188173.msg3970801#msg3970801 date=1300825363]
Solid motor mounts (StreetUnit, TRZ, CP-E, AWR). Not only is the sound louder from behind the wheel, but it provides a great feel as well. And, it nearly eliminates wheel hop at the start line or pulling through a corner. This won't help your friends hear you, but it will help the driving senses tremendously. If you want to further enhance the feel, get some braided brake lines too.
[/quote]

Not HS legal


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post #6 of 37 (permalink) Old 03-22-2011, 04:31 PM Thread Starter
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

[quote author=cali_axela link=topic=188173.msg3970767#msg3970767 date=1300824377]
There are quite a few very nice catbacks which are stock class legal. My personal favorite is the Racing Beat exhaust.

It's very tricky to get the entire OEM catback out as one piece because it's bolted on before the rear subframe at the factory; so most exhaust shops just cut it in half then take it off. Most aftermarket exhausts arrive in 2 or 3 pieces that bolt together so they're easier to reinstall than the stock one is to remove.
[/quote]

Perfect. Racing Beat says there's 2 different types of exhausts, something about bolt-together and one-piece. I assume the link you sent me is definitely what's under my car, yes?

Also, $525 isn't obscenely expensive, but is there anything cheaper that's not too ricey-sounding? I was hoping to stay around the $400 area, but if I have to I will.

-Eric
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post #7 of 37 (permalink) Old 03-22-2011, 04:33 PM
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

Quote:
Not HS legal
Wow really?!?! Wouldn't have thought of that as being a significant performance upgrade. Just looked it up and he's right, replacing motor mounts is not legal in Stock. That sucks...nevermind then.

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post #8 of 37 (permalink) Old 03-22-2011, 04:51 PM Thread Starter
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

Wow you guys are fast!

The borla is out of my price range! LOL Looks really nice though...

I thought about engine mounts a while back because I can feel the engine bobbling around sometimes even just during normal driving, but my hopes and dreams were shattered by reading the rulebook.

Oh well, it keeps me from spending money I shouldn't... well, some of it at least.

Thanks for the replies guys!

Any other suggestions? I'm liking the looks of the RB one so far...

-Eric
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post #9 of 37 (permalink) Old 03-22-2011, 05:05 PM
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

My suggestion is to hold out for a used exhaust, either RB or Borla. They go for quite a bit cheaper than new and will still have all the weight and sound benefits, as long as you don't care about the tip already being a bit dirty!


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post #10 of 37 (permalink) Old 03-22-2011, 05:41 PM Thread Starter
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Re: Newbie Autocrosser, annoyed that I can't hear my car on-track!!

Fair enough.

I kinda want a new system though Rather than waiting for someone to get bored with theirs.

It must not be as popular as the Corksport exhaust since I can only find about 3 videos on youtube that I'm convinced are the right exhaust.

I may actually have to go for it. It seems like about the right noise level. I don't want to sound like a d-bag every time I pull into a parking lot or gas station, but I would really like to be able to hear the thing in the car.

Thanks again!

-Eric
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