Solid motor and Trans mounts
You may regret it, unless it's a ball-to-the-wall race car, and the movement of the motor and transaxle is causing performance or safety issues. Solid mounts come with lots of obnoxious vibration at no extra charge. Polyurethane is a reasonable alternative that still offers some degree of isolation.
You really need to be pushing a lot of power, like in a dedicated race car, to justify going with SOLID mounts.
I have poly mounts in my S13 and thats a strict track car only. No title, no plates, no turn signals, just balls to the wall performance. To solidify (no pun intended) what everyone is saying about solid mounts, when I used to run the car for autoX only I ran solid mounts on everything from motor to exhaust. At idle you felt like you were breaking teeth and at WOT it felt like you were about to break the car in 2... Now we ARE talking several years of engineering in the making here but it wont be much better than what I just described. I run poly now all the way thru because you dont lose much performance between solid and poly but the comfort level is drastic.
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