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KnockBlock G4+ (KNB)
KnockBlock G4+ (KNB)
KnockBlock G4+ (KNB)
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KnockBlock G4+ (KNB)

Marsoni M251S
Sale price$284.50
Pay 4 payments of $71.12 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
KnockBlock G4+ (KNB)The G4+ KnockBlock is an essential tool for tuning and can aid in the early detection of incorrect ignition timing, lean air fuel mixtures and mechanical issues. It is used it with ear buds, headphones or noise cancelling ear muffs and features special filtering to allow you to listen in and detect knock early. Listen to one or two knock sensors Special filtering design improves signal to noise ratio Can be used with ear buds, headphones or noise
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Your KnockBlock G4+ (KNB) orders ship within 1-2 business days.

Delivery Options:

  • 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
4.0 ★★★★★
Based on 612 reviews
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Product Reviews
A
Verified Purchase
AikenSCGuy
Birmingham, US
★★★★★ 5
Nice phone holder
This is a great product. I bought a car that had the base installed so I bought one to be able to use it. Holds great!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 2, 2025
X
Verified Purchase
xiTzMoEx
Lowell, US
★★★★★ 1
Use locktight red or blue
Product comes loose frequently and its extremely annoying to tighten it takes forever
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 4, 2025
M
Verified Purchase
MrRich
Chelsea, US
★★★★★ 2
Metal tab blocks magnetic charging
The set screws are too small and they do not have an adapter that fits the magnet charging rings on the newer phones
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 4, 2025
J
Verified Purchase
J&A
Chelsea, US
★★★★★ 5
My favorite BMW car mount.
This is my favorite mount for BMWs. I have them on two cars (X4M and a 328), but I always modify the mount and install a metal ball (purchased here on Amazon) so I can mount an ESR Wireless charger. This combo is the best charging mount and system I have ever tried
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 17, 2023
N
Verified Purchase
norns
Massapequa, US
★★★★★ 5
sturdy mount nice fit
fit nicely and magnet is strong using the included metal disc to put inside phone case. was missing instructions but figured it out. you have to screw in the small set screws until it is snug. using a longer hex key made it easier.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 10, 2023

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