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ARP 81.5mm Ring Compressor
ARP 81.5mm Ring Compressor
ARP 81.5mm Ring Compressor
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ARP 81.5mm Ring Compressor

Marsoni M251S
Sale price$68.23
Pay 4 payments of $17.06 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
ARP 81.5mm Ring CompressorSKU: 901 8150 UPC: 672036022327 ARP 81. 5mm Ring Compressor for VW Audi 1. 8T, Honda B18, BMW M42 ARP 81. 5mm Ring Compressor (901 8150) simplifies piston installation in performance engines with 81. 5mm pistons including VW Audi 1. 8T, Honda B18, and BMW M42 builds. This precision tool delivers even clamping force to slide pistons into cylinders without ring damage or wall scoring. Built for consistent results in street and race engine assemblies.
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Your ARP 81.5mm Ring Compressor orders ship within 1-2 business days.

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  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

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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]
  • Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 368 reviews
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A
Verified Purchase
Amethyst Cam
Phoenix, US
★★★★★ 5
Good quality and good value
Size: 2+6+1+12 Pack
this is a great deal and so nice to have on hand. I like being able to just grab replacement parts as needed and not have to place orders for them. It gives peace of mind to know I already have them on hand. much more affordable to buy all at once too 
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 29, 2025
J
Verified Purchase
Jack J
Lake Worth, US
★★★★★ 5
Works well
Size: 1+6+6 Pack
Fit perfect
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 11, 2026
L
Verified Purchase
liliana g.
Bozeman, US
★★★★★ 5
Fits and works fine
Size: 1+6+6 Pack
Its a good deal for all the things it comes with.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 17, 2025
M
Verified Purchase
margarida santos
Alexandria, US
★★★★★ 4
Easy to use.
Size: 2+6+1+12 Pack
They work very well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 8, 2026
J
Verified Purchase
just bookstore
Whiting, US
★★★★★ 5
Not so good
Size: 2+6+1+12 Pack
These placement filters are not as good as the original. They seem to hold onto the debris & don't release it into the reservoir. I clean the filter & reservoir after each use & always find the filter full & the reservoir nearly empty.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2025

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