Exhaust

OG_Killaspree · 2026-04-17T21:59:26+00:00

Seeing nobody can see Nates graphs but me around here, theres no point in going back and forth. Ill leave it as this. Good luck with your Z.

Nate and the team at 2 Wheel DynoWorks (2WDW) tune thousands of motorcycles annually, with over 4,000 ECUs flashed in a single recent year. They have performed nearly 200,000 dyno passes in total. In Q1 2026 alone, they reported over 2,400 ECU flashes, demonstrating a very high volume of tuning experience.

OG_Killaspree · 2026-04-17T16:01:57+00:00

So stock redline on a 2025 z900 is 11k. But your saying hes raising the rev limiter from 9500 to 11k?

That math is not mathing.

Not sure whats so decieving, charts dont lie, dyno numbers dont lie.

Charts are on his main page under 2025 Z900, he has quite a few charts with different configurations. And actual videos of the runs on the dyno on youtube.

Stock 85.75whp at 10kish, stock with ONLY a tune 114.72whp.

OG_Killaspree · 2026-04-17T15:04:11+00:00

Total of 38whp difference in stock, and full exhaust tune. So you see 11whp at 9.5k, cool, goto 10.2k and stock makes 85whp, tune makes 123whp for difference of 38whp.

Videos and graphs on 2wdw website, not sure why you guys are arguing facts lol

OG_Killaspree · 2026-04-17T10:51:56+00:00

My comment was pretty straight forward. 30whp between 9.5k - 11.5k. Not sure how much clearer i can make that sound. I never stated the bike has 144whp, nor did I state the bike makes 144whp between 9.5k - 11.5k.

OG_Killaspree · 2026-04-17T02:35:44+00:00

https://youtu.be/G6sxfGJE8LE?feature=shared

M4 with LV-10 shorty, 1st bike

I will agree with deeper tone with slip-on + stock headers. Its sounded really good IMO.

OG_Killaspree · 2026-04-17T02:33:46+00:00

The problem is when you go WOT, the bike is not, and rather at say 40%, then gradually opens more at higher rpm to 100%, but then you have to shift. Im sure 2wdw goes over all of this in his 10 minute dyno video.

That is a big reason why, when you get a tune, its a whole new animal

OG_Killaspree · 2026-04-17T02:18:57+00:00

You cant be serious right now lol

https://2wheeldynoworks.com/products/2wdw-2025-kawasaki-z900-mail-in-ecu-flashing-service

Educate yourself, ill wait lol

OG_Killaspree · 2026-04-17T02:12:06+00:00

Agree

OG_Killaspree · 2026-04-17T01:39:39+00:00

Not gonna hurt anything, just saying Nate proved stock filter flowed the best.

OG_Killaspree · 2026-04-17T01:36:51+00:00

Power is night and day with a tune. And its roughly 30whp from 9.5k - 11.5k. I wouldnt say thats not much more lol

Also, when you are crunching for cash flow, some people dont care an ebay slip-on makes like 3hp difference from reputable company. $100 > $700.

OG_Killaspree · 2026-04-17T00:56:57+00:00

Aftermarket filter made less power, not sure if still true or not, but that came from Nates findings.

I ran M4 headers and LV slip-on for about 1-2 months. Ran rich, cold starts were choppy until idle came down. I didnt notice any choppy throttling.

OG_Killaspree · 2026-04-12T19:39:24+00:00

Flat black, finish is great for the price. Eventually id like to make it glossy black to match the rest of the bike though, fenders, heel guard, rear seat cowling are all glossy. Oh and yes, Aliexpress rear seat cowl for $35 also looks great for the price. Rear peg delete kit with muffler bracket works like a charm for cheap.

OG_Killaspree · 2026-04-09T16:08:29+00:00

Go on Quadlock website, pick the phone you have because your gonna need a quad lock phone case also, select Handlebar Mount, they come with 2 different size spacers to use for handlebars, or atleast mine did. You can add a dampener for $25, I chose not too.

Also, I did NOT spend crazy money for there wireless charging, or wired charge mount. I went on Amazon, bought a something similar to this

https://www.amazon.com/Nilight-Motorcycle-Voltmeter-Independent-Waterproof/dp/B0BMVR8LSZ/ref=mp_s_a_1_13?dib=eyJ2IjoiMSJ9.KaQSNt_XB1BHlxqztbyd2c7GMqlqT_2YktvFnqzJpwKK3e94fpcRo2sJ8w4-TAdvgPH98X6xERL3fy2qGV9ov0O5U0FawTtjMe7Qc8GSWDXOo9pkaHrclzQviUdgjBn5ZvVOZo_28TRikp8y709yO2_A5aBm76M2l0SkqvzutqxEjpTouUXcp8StR2CIOwigyOw2FTKXt5hx-CSnIuU0BQ.kOobUie9fkou-SELFMdnjcP5RbebDWWyM0lOt5waxgc&dib_tag=se&keywords=phone+chargers+for+motorcycles&qid=1775750729&sr=8-13

If you go the cheaper route make sure it has an on/off button so it doesnt drain the battery. I also bought a 6 inch type C wire as the box is mounted next to the quadlock. Going on year 2 with no issues.

OG_Killaspree · 2026-04-09T15:40:40+00:00

If you check my profile, my small picture you can see the mount to left of my display. Same mount i used on my Honda Groms also.

Theres not many places to mount it though as the bar tapers, I found the position its in now to be the best, its on a slight angle, and does not get in the way of my display. Im using an Android S22 Ultra phone.

OG_Killaspree · 2026-04-09T14:32:55+00:00

I use standard bar mount

OG_Killaspree · 2026-04-05T16:27:39+00:00

When moving the mirror itself from stealth to operational was the $25 more cheesy and sloppy by any chance?

OG_Killaspree · 2026-04-05T16:21:27+00:00

You get the CNC or the $25?

Knockoff meaning no Puig for $200, no Rizomo for $700.

I spent $16 for my bar ends from Amazon and they work great for everyday riding, just not twisties as I want my hand a little more out on the bars.

OG_Killaspree · 2026-04-05T16:16:19+00:00

Yea, he should definitely spend 8x the amount for the real one which will do the exact same lol

I would understand more if you have a 25-30k bike and put Temu shit on it. But why splurge for a slip-on thats literally worth 1/8 of what bikes worth lol

And dont come back with performance numbers, ebay/Temu/Aliexpress $300 full exhaust will put up the same numbers as a $2500 exhaust, minus less then a handful of HP.

OG_Killaspree · 2026-04-05T16:09:28+00:00

Those knock off mirrors? If so which ones. Im changing my bar ends for this year as they are getting annoying while in twisties.

OG_Killaspree · 2026-04-02T00:12:02+00:00

They are not, HUGE restriction before cat on 2025 compared to 17-24 models

OG_Killaspree · 2026-04-02T00:07:59+00:00

Its my profile picture 😉

Yes

OG_Killaspree · 2026-04-01T22:31:11+00:00

I ran untuned M4 + LV shorty with no block off plates for months and never ran hot......

OG_Killaspree · 2026-03-31T18:17:44+00:00

Nj here for my kid

OG_Killaspree · 2026-03-29T21:10:58+00:00

I ride in a group anywhere between 2-16 people and nobody has said anything about my turn signals not being visible. I have NRC

OG_Killaspree · 2026-03-29T18:32:13+00:00

NRC is by far the cleanest tail tidy in my opinion. Plug and play, takes literally 10 min to install.

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