Slightly quieter , yet cleaner sounding when boost blows off. Takes more pressure to blow off than the stock spring. Leading to less little blow offs and better sounding ones when it does.

ZZP Bypass Spring Upgrade

Good quality well-made much stiffer than the stock spring.

No difference but no big deal.

Got here fast and it wasn’t too bad of an install, but I was somewhat disappointed that my car sounded exactly the same as before. For $15, I’m not really too frustrated, no harm I guess.

Non of the parts go to the Cruze like the description stated

I purchased 1.4T high voltage coil pack/ 1.4t valve cover an NGK iridium plugs along with the1.4T bypass valve spring each one stated they were for the 1.4T which I was quickly proved wrong where as not a single part goes to the car

Very happy

Very well made product