BIG SERT M14X1 25X16 8Mm INSERT QTY 51407 Review

Based on our own experience, this product is not worth the investment.the installation process was difficult and the results were underwhelming. The only pro would be that it did slightly improve our suspension, but not enough to justify the cost. The con is that the product did not live up to its advertised benefits..

After trying this product, I have to say that it was a complete waste of time and money. The quality and durability of this insert is terrible, and it failed to meet my expectations..

Glad I found it! My wife's 2004 Mini Cooper S knocked the spark plug out of cylinder 1 and I tried using the stock re-thread kit but it only took about 3 days and knocked it again! So I had to spend 2k on a new head (because it's a JCW version) or get it with the Big Sert rethread kit. It's been a few months now and it seems to be holding up! Hope it lasts! I would recommend taking a small car vacuum and a small clear plastic tube to remove metal shavings. Be careful! Also leave the spark plug…