On the corvette, the filters are out of the way of water and dirt. The original design had them sitting almost directly off the turbos. But STS later redesigned them to put the filters up high.
Turbo-lag won't be an issue. Simple physics: Take a 1 foot straw, pinch or block one end of it and blow through the other. Then do the same with a 3 foot straw. The result will be the same. You'll have no leeway to push any more air into either straws no matter their length. The only variable factor is the elasticity of the material the straw is made out of.
In the case of a rear-mounted turbo, the lag isn't going to be that much different than a front mounted turbo kit. The big variable is the density of the exhaust air, not the density of the intake air. The exhaust air will cool very fast allowing the air to contract into a denser accumulation. However, the mass behind that air remains the same so the end result is almost no different than the front mounted turbo kit. In this case, we're trading time of travel for air density.
Intake air, however, is going to near identical to a front mounted turbo kit because when the car is on, the turbos are always spinning and air is always moving. The pressure in the intake piping is not constant, but never becomes a vacuum. Therefore when the turbos spin faster, the air has nowhere to go but forward increasing pressure in the piping. Increasing pressure at one end of the piping will increase the pressure at the other end equally as the pressure will disperse faster than the air can move. Therefore, the only turbo lag that would be possible would be from the elasticity of the metal piping, which isn't going to be much.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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