Would not be bad to install a pair;as long as they are functional.
over time the sucked oil (blow by from engine) will gum up in the combustion chamber.
unsure your milage on engine or fuel type/quality being used,,,but i've seen lot's more harm than good from the 10% ethanol blended fuel's.
Ethanol fuel (e-85 etc.) work's great when all supporting components are in place for it & the car is tuned for it.....unsure the shelf life or how long you would want it sitting in your tank;as conventional 10% ethanol gas will begin separating as soon as 1 month (+ or - a bit).
I pay more; but continue my ethanol free93 fuel without problems.
The factory fuel system on these car's don't have a return fuel line-as there was one occasion that i had a stumbling under hard load & not accelerating,,,i checked all known connection's from electrical to vacuum & then removed fuel line to rail & purged out some fuel....thinking maybe got some bad gas-but was all clean.
Car ran perfect ever since.
There are way more skilled & knowledgable people on here that have valid input's.
A little more maintenance is required,but catch can's may be a start to prevent gumming up inside the intake system.
Also a failing or clogged fuel system can cause it to go lean & even show mis-fires.
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