GRB Walk Entry

Marsoni

M251S

$39.00

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

GRB Walk EntryTERMS & CONDITIONS In participating in the GRB Challenge, I agree to the following Terms and Conditions: I understand that the GRB Challenge is a personal challenge and not a race. I understand that it is my responsibility to obey the rules of the Highway Code to keep both myself and other road users safe. I acknowledge that this event is an extreme test of a person's physical and mental fitness and have with it the potential of death or serious

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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.
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Didn't really believe the hype. Did a little research and watched Project Farm and decided to try. Im not a snake oil guy....but I will say my 2013 common rail TDI is quieter and I get a tad more fuel mileage. Does it pay for itself? Well, it does get better mpg, but I feel the reduction in noise most likely relates to less wear and tear and thats good enough for me. Im only using 1oz per fill up (about 14 gallons) so it lasts a very long time. I get 40mpg and im not light footed.

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Reviewed in the United States on April 2, 2026

Verified Purchase

James Jay

Louisville, US

★★★★★ 5

It's a spark plug

What i needwd

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Reviewed in the United States on May 27, 2026

Verified Purchase

Omaha, US