Shock Absorber Type 643 Competition Q

Marsoni

M251S

$627.50

Get it in 3 business days with 1 day shipping. Friday, May 29

Shock Absorber Type 643 Competition QDiagonally mounted compression reservoir. The CNC milled aluminum bracket positions the reservoir at an angle for easy installation and excellent access to the adjusters. High and low speed compression can each be fine tuned in 22 steps. Rebound uses an open bleed system and is likewise adjustable in 22 clicks. Spring preload is continuously adjustable for riding with a passenger or luggage manually or, optionally, hydraulically. As usual, spring and

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Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.

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Reviewed in the United States on April 27, 2026

Verified Purchase

Britincali

Boise, US

★★★★★ 5

Upgrade from OEM

After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is. These were an upgrade from OEM parts. They were gapped perfectly for the car. They took 20mins to fit and work fine.

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Reviewed in the United States on February 11, 2026