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Unitronic Stage 2 ECU Performance Tune C8 RS6 / RS7 4.0TFSI

Marsoni M251S
Sale price$765.00
Pay 4 payments of $191.25 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Unitronic Stage 2 ECU Performance Tune C8 RS6 / RS7 4.0TFSIUnitronic Stage 2 : 819HP 760LB FT STOCK POWER: 621HP 627LB FT For Audi C8 RS7 Performance 4. 0 TFSI EA825 Change Vehicle Octane 93 Octane 98 Ron gas 91 Octane 95 Ron Gas HP +198 LB FT +133 Description Unitronic Stage 2 Performance software is precisely calibrated for use with 93 AKI 98 RON fuel. NOTE: An SFD SFD2 unlock may be required for some MY23+ models. Click HERE for more information or contact Unitronic to learn more today. Power figures may
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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4.8 ★★★★★
Based on 962 reviews
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NicanorTij
Grantham, US
★★★★★ 5
Fits true to size and good quality
Color: Black Grey Heather, Size: Large
I gave this 5 stars because I was pleasantly surprised by the fit and quality. The zipper is nice, it zips firm, it's not flimsy like a cheap zipper. For reference I am 5'7", athletic build, and 198 pounds. I ordered a size large and it fits perfect. I will buy more for sure.
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Reviewed in the United States on November 9, 2025
L
Verified Purchase
LCAH
Lake Worth, US
★★★★★ 5
Great fit, excellent material. Will buy more!
Color: Cobalt Heather, Size: Small
Great quarter zip comparable to the high end designer brands. Buttery material, well fitted. Runs a bit big so I sized down and it’s a perfect trim cut fit. Will buy other colors. Would like to see some patterns in addition to the solid colors. I’m 5’10” 165lbs and small size fits perfectly.
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Reviewed in the United States on September 20, 2025
B
Verified Purchase
Brian C.
Carnegie, US
★★★★★ 5
Perfect for the gym!
Color: Cobalt Heather, Size: XX-Large
I bought 2 (black and blue) and wear them to the gym weekly. They wash & dry very well! They are nice enough for casual wear too. I’ll probably buy a 3rd color soon!
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Reviewed in the United States on April 23, 2026
B
Verified Purchase
bcnaranjo
Belleville, US
★★★★★ 5
Good quality
Size: XX-Large, Color: Dark Green Melange
I love these quarter-zip pullovers. I bought this one as a gift, but I personally own two others myself, which should say a lot. They’re comfortable, lightweight, and extremely versatile. I wear mine for golf, casual office days, and layered when it’s cooler out—they pair well with just about anything. For the price point, they really can’t be beat. The look and feel are comparable to options that cost significantly more. Great value, great performance, and a sharp, clean style. I’ll likely keep buying more.
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Reviewed in the United States on March 3, 2026
B
Verified Purchase
Brian F
Battle Creek, US
★★★★★ 5
Nice golf pullover
Size: XX-Large, Color: Colony Blue Melange
Nice pullover 1/4 zip. Quality is pretty decent, the color and fit is really good. Leaves good flex room in the shoulders. The material isn’t to heavy and can be worn with a vest if needed. The only thing about the fit is the sleeve length. I wear in a dress shirt 35”-36” length and this hangs past my thumb.
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Reviewed in the United States on March 18, 2026

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