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Borla Boomer Muffler Thumper Oval 2-1/4in In 4in Side Rount Out

Marsoni M251S
Sale price$149.50
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Borla Boomer Muffler Thumper Oval 2-1/4in In 4in Side Rount OutSKU: 40057 UPC: 808422400572 Borla Boomers Muffler Thumper 2. 25in Center Inlet 4in Single Round Tip 4. 25in x 7. 88in Oval x 14in Long Body Universal Fit The Borla 40057 Thumper Boomer Muffler delivers the signature Borla Sound of Power through its patented race proven design. This universal muffler fits custom exhaust setups on cars, trucks, and performance vehicles with 2. 25 inch piping for gains in horsepower, torque, fuel economy, and engine
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4.1 ★★★★★
Based on 1121 reviews
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Evan C. Lombardi
Draper, US
★★★★★ 5
European oil… Japanese engine… zero regrets 🇪🇺➡️🇯🇵
Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40, Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40
Yes, I know what the label says. “European Car Formula.” Yes, I put it in a 2002 Subaru WRX bugeye with an EJ257 block and EJ205 heads. And yes—this oil absolutely slaps. This engine is not stock, not delicate, and definitely not living an easy life. It sees spirited driving, boost, and the occasional questionable decision. After switching to Mobil 1 0W-40, cold starts are smoother, oil pressure is rock solid, and the motor just feels happier. No weird noises, no drama, no oil consumption surprises. The viscosity is perfect for a performance Subaru build, especially if you’re running tighter tolerances or want strong protection under heat and load. It’s thick enough when hot, flows great when cold, and inspires confidence every time I turn the key. Is it technically “European”? Sure. Does my Subaru care? Not even a little. If you’re running a built engine, turbo setup, or just want a proven, high-quality oil that punches above its weight, this stuff earns its reputation. My bugeye may not be European, but it’s living its best life on this oil. Would absolutely buy again—passport not required.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 18, 2026
R
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Ruben
Birmingham, US
★★★★★ 4
Great oil
Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40
No issues
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Reviewed in the United States on May 17, 2026
J
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Jose Perez
Charlottesville, US
★★★★★ 5
they give what they offer
Size: 5 Quart, Style: Full Synthetic, Configuration: 0W-40
great service from seller it was exactly how much oil quantity i ordered and its great quality
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Reviewed in the United States on May 29, 2026
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Gregory Allen DeAtley
Carnegie, US
★★★★★ 5
Works great
Number of Items: 4, Style: SILZKAR7B11
Exactly what it is supposed to be ! Good service
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Reviewed in the United States on May 6, 2026
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Kim Justice
Pawtucket, US
★★★★★ 5
Perfect
Number of Items: 4, Style: SILZKAR7B11
Great Quality. Worked Perfectly.
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Reviewed in the United States on December 13, 2025

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