FIAMM 72112 Freeway Blaster LOW Note Horn https://www.amazon.com/dp/B000DINKPQ/ref=cm_sw_r_cp_apa_i_hKvfBbYVCHJ8D
I'm running this one. Water killed my stock one.
Less than 15 bucks shipped (shows free same day for me, but we have a hub here and I have Amazon Prim) and it fits under the stock horn cover no problems. Plug and play, mounts up just like the stock one (a little tighter fit, but no trimming or anything needed. It is LOUD, and doesnt have that high pitched wussy tone. Its fairly deep and aggressive. It's also a car horn.
Did I mention it's LOUD?!?!?
You must take a part front bumper. But Ieave undercover bolts. You have to take other bolts tho from tire and top part. It opens like books. And you can just put it back. No car lifting. Its on youtube and amazon is pretty good. I just replaced with this. FIAMM 72112 Freeway Blaster Low Note Horn https://www.amazon.com/dp/B000DINKPQ/ref=cm_sw_r_cp_api_i_3iI6Cb1BXRJPR
Here:
https://www.sparkfun.com/products/11015
https://www.paintballgear.ca/co2-tank-air-horn
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If you need help putting either of these together PM me, but stop blaming the delivery driver for you being lazy.
Replace that horn. Easy, cheap. So many options.
I used this to replace my Prius' "meep meep" horn. It was MUCH louder and beefier.
Fiamm 72112 Freeway Blaster LOW... https://www.amazon.com/dp/B000DINKPQ?ref=ppx_pop_mob_ap_share
This is the one I used
Solve your problem for under $15.
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People really look at my Z125 when I blast them with that thing.
I have 2 FIAMM 721X2 horns, they are the standard electromechanical type like this. There's really not much difference between this horn and any other standard automotive horn, they're all very similar.
Here's one for sale on amazon, but I got them as a two pack with both the high-low tone horns in one package from an auto parts store. Here's the exact converter I had.
I don't understand why this information is of any use, I would think component level model numbers like what chip was actually used in the converter, what the switching transistor, output capacitors, etc would be 1000x more useful.
Heated seats...sounds like you got the Mazda 3s Grand Touring. Assuming you have the factory HID's and LED tail lights, so no need to upgrade those. Unless you can find the clear projector lens to swap into your headlights.
Summer tires, if you live in the right climate. Extremely durable, better performing, and with better ride quality Koni FSD dampers as the OEM ones fail/leak prematurely. OEM big brake kit. Lots of advantages to this versus an aftermarket braking solution.
Do you have the manual transmission? OEM leather and piano black shift knob from European markets. OEM heated side view mirrors if not equipped, which I've found to clear away fog and rain pretty quickly. The Corksport Mazda3/Mazdaspeed3 steering wheel looks really, really good and almost OEM (black inserts/black stitching). Aftermarket HVAC knobs.
Speaking of rain, Valeo 900 Series/Ultimate wipers for a cleaner & more premium OEM look. Did the +1 driver/-1 passenger mod and lowered the passenger/right side windshield wiper to a more tucked position, and it won't flap at very high speeds or windy conditions.
LED interior/exterior lights - For the trunk, get this in the 5K color. For your license plate and front map lights, get these in the 5K color. Haven't found any rear dome festoon/DE3175 LED bulbs that I'm happy with yet (VLEDS, Retrofit Source, ijdmtoy, superbrightleds, Corksport, etc). Not bright enough, not white enough (usually a blue tint), bleeds different colors, etc. I may try an interior set from GTA Retrofits. For your glove box, either this in 5,000K or a Sylvania/Philips/Osram 194 LED bulb in 6,000K. Went with the latter since they were left over from experimentation and are actually closer to a 5,000-5,500K, even though they're listed as 6,000K.
Fiamm low tone horn to compliment the wimpy high tone.
There's more but that's all I have time for =)
Get a pair of hi/low freeway blasters!
http://www.amazon.com/FIAMM-72112-Freeway-Blaster-Horn/dp/B000DINKPQ
I used this guide for my 2007, but it's a similar process for others (just get the bumper off and figure out where the horn plugs in):
I added a Fiamm freeway blaster low tone horn to the stock horn. Two tones = louder and the high and low notes together gives it a nice sound.
http://www.amazon.com/FIAMM-72112-Freeway-Blaster-Horn/dp/B000DINKPQ
check this out http://www.amazon.com/FIAMM-72112-Freeway-Blaster-Horn/dp/B000DINKPQ
They sell these at most auto parts stores as well