The difference probably won't be noticeable as long as the rear mounted block is more or less air tight. But if you want stealth, then make it clear and in front,
like mcrews':
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread