The stock snub mount is very soft and weak, allowing a lot of play on the longitudinal axis of the engine, which impresses load/tension on the rest of the drivetrain. The stiffer aftermarket units aren't nearly as sloppy, ranging from just a stiffer version of the stock parameter to some that full the forward mount cup, limiting almost all of the 'play'. This reduces drivetrain shift, improving the responsiveness of the car slightly, lowering the stress exerted on the other mounts and mounting points as well improving the precision of the shift gate due to the reduced play in the drivetrain.
The APR unit is garbage in my opinion, I have only heard of two people to ever speak highly of this mount, while anyone else has had nothing but trouble. Mine lasted ~18,000mi, before I noticed it was destroyed, who knows how long before it initially started failing. The mount cracked in half and was working itself out of the mounting cup. The car became very sloppy and would randomly pop out of gear or completely refuse to go into gear at all. This mount is the most expensive as well at ~50$, which further makes me wonder WTF?!.
Here is my APR snub:
The Apikol and Sterm mounts are receiving good reviews here on Audizine, and considering that 034Motorsports supports Apikol, I have complete faith that it is a sound design.
Personally, after my APR snub failed, I moved on to the Neuspeed unit. It fills the cup more completely and has reliefs in the parameter to help endure flex from the sidewall pressures when loaded. The design is the best and most unique in my opinion and the feel compared to the OEM or even the APR when it was new is stellar! Very firm and precise. There was a noticeable vibration at idle, only slight though and it isn't obnoxious or emitting any level noise. It softly permeates from the steering wheel and shift lever reminding you of the solidity of your drivetrain.
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