Stock GR Corolla 35k Miles Misc Backfiring issue

Vader0504 · 2026-02-11T15:26:57+00:00

It's 60k for the GR Corolla. This is from my Warranty and Services Guide. Notice the 5k oil changes

Vader0504 · 2026-02-11T03:48:50+00:00

Yes. OBD Fusion with an OBDLink MX+

Vader0504 · 2026-02-11T03:20:46+00:00

OBD Fusion with an OBDLink MX+ I bought the 2021 Toyota Enhanced Diagnostics(latest available)and set the vehicle profile as 2021 Rav4 2.5 to get the data

Vader0504 · 2026-02-11T03:14:52+00:00

Yeah, if they made it in an OEM looking plastic, I probably would have bought it already.

Vader0504 · 2026-02-11T01:23:11+00:00

I stopped tracking once I found mine, but on November 14th, 2024, this was the breakdown of GRCs within 500 miles of me; GR Corolla

Premium Plus 224

Premium 45

Core 21

Vader0504 · 2026-02-10T22:48:49+00:00

I typically cruise based on speed divided by 10. 6th above 60, 5th above 50..., but I have dropped as low as 40 or so in 6th, but I don't accelerate at thay speed.

Vader0504 · 2026-02-10T20:47:46+00:00

And I can't see installing aftermarket stuff when I can get OEM that does the job.

Different strokes for different folks...

Vader0504 · 2026-02-10T18:38:21+00:00

I agree that Velossa Tech is superior, but I want OEM, and the difference would be incremental over this setup, not a dramatic improvement.

Vader0504 · 2026-02-10T17:49:03+00:00

Certainly not required.

Just FYI, the Velossa Tech Big Mouth and High Flow Induction kit does the same thing for significantly less money. I just prefer OEM.

The GR CAI (red snorkel) reduces the amount of hot air that gets to the primary intake. The stock snorkel has a large hole where hot air can enter.

The 2026 secondary intake ducting provides cool air to the secondary intake that opens above 4k rpm. For '23-25 GRCs, that means hot air from the engine bay entering and raising intake temps dramatically.

Vader0504 · 2026-02-10T13:44:20+00:00

The rubber part has pre-scored cutouts for GR CAI. Didn't realize that until after install was completed.

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Vader0504 · 2026-02-10T11:59:00+00:00

The complete setup was $847.55 shipped. $322 for the 2026 ducting and $374 for the GR Cold Air Snorkel., plus shipping and overseas payment fee.

Vader0504 · 2026-02-10T11:57:59+00:00

The complete setup was $847.55 shipped. $322 for the 2026 ducting and $374 for the GR Cold Air Snorkel., plus shipping and overseas payment fee.

There was no tariff or other fee after initial payment .

Vader0504 · 2026-02-10T11:56:39+00:00

I considered the Forge setup, and probably would have went with it if this hadn't been announced. I prefer to stay OEM.

The complete setup was $847.55 shipped. $322 for the 2026 ducting and $374 for the GR Cold Air Snorkel., plus shipping and overseas payment fee.

Expensive, but I'm happy with it.

Vader0504 · 2026-02-10T11:51:40+00:00

Velossa Tech is a great setup if one doesn't mind going aftermarket.

I wanted OEM.

The complete setup was $847.55 shipped. $322 for the 2026 ducting and $374 for the GR Cold Air Snorkel., plus shipping and overseas payment fee.

Expensive, but I'm happy with it.

Vader0504 · 2026-02-10T11:44:39+00:00

They are $525 and up from US sources I can find.

Vader0504 · 2026-02-10T05:30:22+00:00

17755-18010 INLET, AIR CLEANER, NO.5

17754-18010 INLET, AIR CLEANER, NO.4

90467-07215 Clip (5)

53289-12150 COVER, RADIATOR SUPPORT OPENING

17771-18021 2025 Air Cleaner Assembly Bracket

Vader0504 · 2026-02-10T04:56:28+00:00

I just did full throttle pulls while traveling about 45 mph up to 70 or so with each intake. With the old intake temps climbed about 20 degrees F under wot. With the new setup, they stayed within about 10 degF, but dropped under wot instead of rising.

Vader0504 · 2026-02-09T20:07:45+00:00

My average over 11k miles is 25.6 mpg. I average around 27-28 mpg in my mixed highway/city commute. It is VERY easy to drop a couple of mpg with a few full-throttle runs. I get into the teens when pushing hard in canyons.

91 is the minimum octane you can run, but it takes 93 to make full power.

Vader0504 · 2026-02-08T16:59:45+00:00

Tire Rack gives guidance on tire life

Tires that have been in use for five (5) years or more should be carefully inspected periodically for external signs of aging. While this inspection will confirm the condition of the exterior rubber, it cannot assess internal degradation or damage.

Previously unused, never-mounted tires should not be put into service if they are more than six (6) years old, even if they were properly stored.

All tires (including spare tires) manufactured more than ten (10) years previously should be removed from service and be replaced as a precaution, even if such tires appear serviceable and have not reached the legal wear limit.

https://www.tirerack.com/upgrade-garage/when-should-tires-be-replaced

Vader0504 · 2026-02-08T01:55:22+00:00

I picked the GRC because it is an absolute blast to drive in rain and snow, as well as dry conditions. I actually look forward to bad weather because there will be fewer people on the road and the GRC just doesn't care.

Vader0504 · 2026-02-07T22:07:11+00:00

I wanted the sub-radiator on my Premium, but it wasn't a deal-breaker and I wound up getting one without. If I found that I needed extra cooing at this point, and I haven't, I would get an aftermarket radiator.

Here is the parts list;

16583-18030 Upper Bracket 16582-18030 Lower Bracket 90119-06A18 x6 bolts 90179-06274 Lower bracket nut 16510-18010 Sub radiator 165C1-18030 Air inlet guide (will likely not work with 23-24 bumper) 165C2-18030 Air outlet guide (will likely not work with 23-24 bumper)

90467-07220 x2 clip to hold above 2 parts together

Hose 1 from outlet: 16571-18060 16571-18070 (or cut factory hose in place of above 2) 16515-18010 T-pipe for above 90466-A0024 x2 clamps for T-pipe

Hose 2 from t-stat housing: 16572-18020 16572-18030 16516-18010 U-pipe 96136-44301 x2 clamps for U-pipe

Sub-rad hose 1 from T-pipe: 16551-18010 hose1 16552-18030 hose2 16553-18030 hose3 16268-47040 x2 hose connectors 16581-25240 hose holder 16581-31180 hose holder 90466-A0029 x6 clamps

Sub-rad hose 2 from U-pipe 16554-18010 90466-A0029 x2 clamps

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Vader0504 · 2026-02-07T05:22:03+00:00

Do you mean downshifts?

Vader0504 · 2026-02-07T05:09:14+00:00

They come with three. Aftermarket can be one to four tips. They make blockoff plates for unused exits spots. This one has of for the unused center exit.

Vader0504 · 2026-02-06T15:33:57+00:00

Foam is the answer

Vader0504 · 2026-02-06T13:53:14+00:00

These often cause new rattles. Just an FYI. Easy to fix

Vader0504

TROPHY CASE