GSC P-D Valve Seat Set OEM Replacement EJ205/EJ207/EJ257

GSC P-D Valve Seat Set OEM Replacement EJ205/EJ207/EJ257

Marsoni

M251S

$22.44

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

GSC P-D Valve Seat Set OEM Replacement EJ205/EJ207/EJ257SKU: 1005 GSC Power Division OEM Replacement Valve Spring Seats EJ205 EJ207 EJ257 1999 2015 Subaru Impreza WRX STI GSC Power Division OEM replacement valve spring seats fit Subaru EJ205 EJ207 and EJ257 turbo engines in Impreza models from 1999 to 2015 including WRX and STI variants. These seats match OEM thickness for direct drop in installation with stock springs or GSC upgraded kits like 5043 and 5743. They deliver dependable valve train stability

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Have not installed this yet, so this is only a first impression review. I bought it to use in the wheel well area on my truck, so I’ll update later once I actually get it on and see if it makes a real difference. So far it looks good out of the box and seems straightforward enough. One thing I’d recommend is making sure you have a sound deadening roller for install, because I would not try putting this on without one. Too early for me to say how well it works for road noise since it is not installed yet, but I wanted to post my initial thoughts for now and will update later.

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Reviewed in the United States on April 2, 2026

Verified Purchase

Phil Cobb

Boise, US

★★★★★ 5

Great product, very impressed

Looks good, adhesive grabs well, forms well to floor pans. Price is great will be ordering more again. It definitely deadened the tin can sound you can get.

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Reviewed in the United States on March 29, 2026

Thnk_big

Belleville, US

★★★★★ 5

Solid Product, lots of it too

Ive had the insane rattling from my subwoofer and the highway drone from my aftermarket exhaust, and this 80mil sound deadening mat was the exact fix I needed. The 36 sqft kit (which comes as 33 pieces) was plenty to fully cover my trunk, rear deck, and floorboards. Since it's a butyl-based material, there’s no awful asphalt smell, and it adhered incredibly well with just a simple roller. The difference is honestly night and day. My bass hits so much tighter and cleaner now without the whole back end vibrating like a tin can. Even better, the cabin is significantly quieter at high speeds; that aggressive exhaust drone is finally muffled to a deep, tolerable purr. If you want an affordable way to upgrade your audio quality and actually hear your music on long drives, I highly recommend this! It took some weekend elbow grease, but the payoff is incredible.

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Reviewed in the United States on March 24, 2026